53% (1985)

61% (2004)

54% (1982)

56% (1984)

49% (1970)

42% (1981)

28% (1966)

47% (1973)

56% (1975)

45% (1982)

10% (1976)

45% (1975)

64% (1979)

58% (1967)

25% (1985)

37% (1987)

43% (1988)

52% (1970)

65% (1969)

44% (2009)