1971

1980

1985-1986

1990

1995-1996

2000

2008-2010

0 - 9

36.3

26.5

15.2

8.9

4.7

2.3

3.0

10 - 19

45.6

30.5

20.1

14.9

9.4

5.7

4.7

20 - 29

48.3

31.5

23.4

16.8

15.1

11.8

10.5

30 - 39

46.1

43.8

36.6

30.4

23.6

21.8

16.4

40 - 49

51.0

52.6

48.5

44.9

37.2

33.4

22.6

50 - 59

54.4

59.9

56.6

54.0

50.5

48.5

36.4

60-

42.9

56.4

60.4

61.2

60.4

63.3

57.1

Grnd-ave

45.6

41.6

36.4

33.8

31.5

31.1

28.9