The United Nations Statistics Division collects, compiles and disseminates official demographic and social statistics on a wide range of topics. Data have been collected since 1948 through a set of questionnaires dispatched annually to over 230 national statistical offices and have been published in the Demographic Yearbook collection. The Demographic Yearbook disseminates statistics on population size and composition, births, deaths, marriage and divorce, as well as respective rates, on an annual basis. The Demographic Yearbook census datasets cover a wide range of additional topics including economic activity, educational attainment, household characteristics, housing characteristics, ethnicity, language, foreign-born and foreign population.

Footnotes:
1: Sep. of each year.
2: Persons aged 15 years and over.
3: Official estimates.
4: April.
5: Persons aged 16 years and over.
6: Luanda.
7: May.
8: Excl. armed forces.
9: Sep.
10: Civilian labour force employed.
11: Prior to 2006: 28 urban agglomerations.
12: Second semester.
13: 31 Urban agglomerations.
14: Persons aged 10 years and over.
15: Methodology revised; data not strictly comparable; Prior to 2003: May and October.
16: Prior to 1996: Gran Buenos Aires; May and Oct.
17: Oct. of each year.
18: Gran Buenos Aires.
19: Oct.
20: Incl. armed forces, Excl. conscripts.
21: Aug.
22: Beginning 1995: estimates based on the 1996 Population Census results.
23: Beginning 1989: estimates based on 1991 Population Census results.
24: Prior to 1986: excl. unpaid family workers who worked less than 15 hours.
25: Beginning 1985, data classified according to ANZSIC; previously classified by ASIC.
26: Beginning 1984: estimates based on 1986 Population census results.
27: Prior to 1980: Aug. of each year.
28: Excl. restaurants and hotels.
29: Incl. restaurants and hotels.
30: Beginning 1978: estimates based on 1981 Population census results.
31: Excl. conscripts on compulsory military service.
32: Prior to 2004: incl. conscripts.
33: Excl. armed forces and conscripts.
34: Incl. mining and quarrying.
35: Incl. the armed forces.
36: Prior to 1990: excl. armed forces; private agriculture and street vendors.
37: April of each year.
38: Prior to 1986: persons aged 14 years and over.
39: New Providence and Grand Bahama.
40: Prior to 1982: incl. petroleum refineries.
41: Prior to 1982: excl. petroleum refineries.
42: Year ending in June of the year indicated.
43: Incl. quarrying.
44: Wholesale and retail trade.
45: Tourism.
46: First and fourth quarters.
47: Fourth quarter.
48: Average of the first three quarters.
49: Incl. professional army.
50: Prior to 1999: April of each year.
51: June of each year.
52: Included armed forces and conscripts.
53: Persons aged 14 years and over.
54: Excl. conscripts.
55: Excl. forestry.
56: Incl. forestry.
57: Urban areas, Nov.
58: Prior to 1996: main towns.
59: Persons aged 12 years and over.
60: Excl. rural population of Rondônia, Acre, Amazonas, Roraima, Pará and Amapá.
61: Prior to 2003: Excl. rural population of Rondõnia,Acre, Amazonas, Roraima, Pará and Amapá.
62: Incl. electricity, gas, water and sanitary services.
63: Excl. restaurants and hotels.
64: Excl. storage.
65: Incl. international and other extra-territorial bodies and activities not adequately defined.
66: Incl. restaurants, hotels and storage; excl. sanitary services and international bodies.
67: Methodology revised; data not strictly comparable.
68: March.
69: Incl. major divisions 2 and 4.
70: Excl. veterinary services, radio and TV broadcasting, repair and installation services.
71: Prior to 1992: state and cooperative sector.
72: Incl. veterinary services.
73: Nov. of each year.
74: Excl. residents of the Territories and indigenous persons living on reserves.
75: Excl. full-time members of the armed forces.
76: Incl. repair and installation services.
77: Incl. sanitary services.
78: Excl. repair and installation services and sanitary services.
79: Excl. business services.
80: Incl. restaurants and hotels; excl. repair and installation services and sanitary services.
81: Fourth quarter of each year.
82: Sample design revised.
83: Beginning fourth quarter 1985: sample design revised. 1985: quarter Nov. 1985-Jan. 1986.
84: Prior to 1982: persons aged 12 years and over.
85: Dec. of each year.
86: Urban areas.
87: State-owned units, urban collective-owned units and other ownership units.
88: Excl. armed forces and reemployed retired persons.
89: Whole national economy.
90: Third quarter.
91: 7 main cities; Sep. of each year; Persons aged 12 years and over.
92: Beginning 1991: estimates based on the 1993 Population Census results.
93: July of each year.
94: Beginning 1987: methodology revised. Data not strictly comparable.
95: Incl. financing, insurance, real estate and business services.
96: Incl. electricity, gas and water.
97: Nov.
98: Estimate not sufficiently reliable.
99: June.
100: Men aged 17 to 60 years; women aged 17 to 55 years.
101: February - April
102: Dec.
103: Government-controlled area.
104: Incl. persons on child-care leave.
105: Persons aged 15 to 66 years.
106: January.
107: Second quarter of each year.
108: Persons aged 15 to 74 years.
109: Prior to 1984: civilian labour force employed.
110: Prior to 1979: Oct. of each year.
111: Santo Domingo City.
112: July.
113: Prior to 1990: persons aged 12 years and over.
114: Persons aged 15 to 64 years.
115: May and Nov.
116: November.
117: Persons aged 12 to 64 years.
118: May, June, Sep. and Dec.
119: Metropolitan areas.
120: Incl. financing, insurance and real estate; excl. restaurants and hotels.
121: Persons aged 6 years and over.
122: Prior to 1997: persons aged 15 to 69 years.
123: December.
124: Revised industrial classification: data for major divisions 6, 8 and 9 not strictly comparable.
125: Incl. mining and quarrying, electricity, gas and water.
126: Prior to 1976: incl. professional army; excl. compulsory military service.
127: Incl. professional army; excl. compulsory military service.
128: Incl. major divisions 2, 4 and 5.
129: Incl. major divisions 7, 8 and 9.
130: Prior to 2002: April of each year.
131: Prior to 1998: persons aged 14 years and over.
132: Incl. repairs.
133: Guatemala City.
134: 5 major cities.
135: Excl. marine, military and institutional populations.
136: Beginning 1985: incl. unpaid family workers who worked for one hour or more.
137: Oct.-Dec.
138: Prior to 1980: persons aged 14 years and over.
139: Estimates based on the 2001 Population Census results.
140: Non-material activities; incl. major division 8.
141: Persons in receipt of child-care allowance.
142: Prior to 1981: excl. persons in receipt of child-care allowance.
143: Averages of 1st January of the year reported and of the following year.
144: Persons aged 16 to 74 years.
145: Prior to 2003: April and Nov. of each year.
146: Aug. of each year.
147: Feb. of each year.
148: Incl. major divisions 2, 4, 5 and 7.
149: Intercensal Population Survey results.
150: Persons aged 10 years and over.
151: Prior to 1998: April of each year.
152: Prior to 1985: persons aged 14 years and over.
153: Methodology revised; prior to 1993: persons aged 14 years and over.
154: Incl. electricity, gas, water and sanitary services
155: Incl. self-defence forces.
156: Excl. hotels.
157: Incl. hotels.
158: Incl. business services and hotels.
159: Prior to 1973: excl. Okinawa Prefecture.
160: Feb.
161: Employment with remuneration in cash.
162: Estimates based on the 2000 Population Census results.
163: Estimates based on the 1995 Population Cencus results.
164: Prior to 2002: persons aged 15 years and over.
165: Incl. border workers and employees of international organizations.
166: Excl. real estate and business services.
167: Incl. real estate, business services and activities not adequately defined.
168: Incl. activities not adequately defined.
169: Prior to 2004: April of each year.
170: Incl. major division 8.
171: Prior to 2007: persons aged 15 years and over.
172: Before 1995, persons aged 12 years and over.Methodology revised; data not strictly comparable.
173: Persons aged 7 years and over.
174: Persons aged 15 to 69 years.
175: Beginning 1992: questionnaire revised.
176: Prior to 1987: persons aged 15 years and over; biennial survey (March-May).
177: Jan. of each year.
178: Excl. major group 210.
179: Incl. major group 210.
180: Prior to 1981: persons aged 14 years and over.
181: Prior to 1970: excl. major group 220.
182: Beginning 1970: incl. major group 220.
183: Curaçao.
184: Jan.
185: Prior to 1984: incl. Aruba.
186: Prior to 2006: persons aged 16 to 74 years.
187: Beginning 2nd quarter 1988: methodology revised.
188: Prior to 1986: excl. unpaid family workers who worked less than 10 hours.
189: Prior to 1980: incl. professional army; excl. compulsory military service. 1980: new estimation method.
190: Omanis.
191: Computed from 1987-88 survey results.
192: Persons working in Canal Zone.
193: Prior to 1994: Asunción metropolitan area and persons aged 12 years and over, except for 1993: 10 years and over.
194: Metropolitan Lima.
195: May-Dec.
196: Lima; excl. unpaid family workers who worked less than 15 hours.
197: Sep.-Oct.
198: Excl. compulsory military service.
199: Excl. regular military living in barracks.
200: Establishments with 20 or more persons employed.
201: Private education only.
202: Excludes public medical, dental and other health services.
203: Before 1999: establishments with 10 or more persons employed.
204: Prior to 1987: fourth quarter of each year.
205: Feb. and Aug.
206: Excl. regular military living in barracks and conscripts.
207: Data not reliable; coefficient of variation greater than 20%.
208: Estimates based on the 2001 Population Census results. Prior to 1998: persons aged 14 years and over.
209: Persons aged 12 years and over; incl. the Azores and Madeira.
210: Prior to 1983: persons aged 10 years and over; Continent; civilian labour force employed.
211: Prior to 1976: persons aged 14 years and over.
212: March of each year.
213: Persons temporary absent from work.
214: Estimates based on the 2002 Population Census results.
215: March: persons aged 14 years and over.
216: 31st Dec. of each year.
217: New industrial classification.
218: Persons aged 15 to 72 years.
219: October.
220: Excl. unpaid family workers.
221: Incl. home-made handicrafts.
222: Prior to 1996: persons aged 14 years and over.
223: Incl. major divisions 4 and 5.
224: The data refer to the residents (Singapore citizens and permanent residents) aged 15 years and over.
225: Revised data.
226: Incl. information service activities.
227: Incl. agriculture, fishing, mining and quarrying.
228: Prior to 1978: persons aged 10 years and over.
229: Excl. persons on child-care leave.
230: Prior to 1976: persons aged 14 years and over; civilian labour force employed. 1976: fourth quarter.
231: Excl. Northern and Eastern provinces.
232: Whole country.
233: Excl. Mullativu and Killinochchi districts.
234: Excl. Northern province.
235: August.
236: First semester.
237: Establishments with 10 or more persons employed.
238: Persons aged 15 to 74 years; prior to 2007: 16 to 64 years.
239: Persons aged 16 to 64 years.
240: Prior to 1986: persons aged 16 to 74 years; excl. unpaid family workers who worked less than 15 hours.
241: 11 months' average.
242: Excluding armed forces and seasonal/border workers.
243: Relative statistical reliability.
244: Jan. and July.
245: Prior to 2001: persons aged 13 years and over
246: Prior to 1989: persons aged 11 years and over.
247: Prior to 1984: second round.
248: Prior to 1983: excl. unpaid family workers who worked for less than 20 hours.
249: Incl. petroleum and gas extraction.
250: Excl. gas.
251: Prior to 1988: ISIC-1 (1958).
252: New series according to 1980 population census; 1980: second semester.