YEAR( t i )

ACTUAL POPULATION( P i )

ESTIMATED POPULATION( P i )

ERROR( t i )

1969 (t = 0)

10,942,705

10,942,705

0

1979 (t = 10)

15,327,061

15,444,677

-117,616

1989 (t = 20)

21,443,636

21448,774

-5138

1999 (t = 30)

28,686,607

29,162,417

-475810

2009 (t = 40)

38,610,097

38,610,096

1