Census year

Total Population

Inter-census population Change

Inter-census Natural Increase

Inter-census net migration (estimate)

1971

11,555,983

2,142,987

2,542,316

−399,329

1981

15,022,839

3,466,856

3,154,796

312,060

1991

18,491,097

3,468,258

4,622,774

−1,154,516

2001

23,151,423

4,660,326

5,556,342

−896,016

2011

26,494,504

3,343,018

5,033,956

−1,690,938