Table 1.

Population census results.

Census year	Population	Average annual growth rate (%)	Population density/km2	Proportion urban (%)	Household size
1956	18,954,704	–	12	31.4
1966	25,785,210	3.1	16	~ 37.5
1976	33,708,744	2.7	20	47.0	5.02
1986	49,445,010	3.9	30	~ 54.0	5.11
1996	60,055,488	2.0	36	~ 61.0	4.84
2006	70,495,782	1.6	43	68.5	4.03
2011	75,149,669	1.3	46	71.4	3.55

Demographics_of_Iran#cite_note-UN_Demographic_Yearbooks-14