69% (1989)

76% (1987)

81% (1979)

56% (1966)

71% (1956)

46% (1997)

68% (1990)

57% (1967)

50% (1986)

70% (1982)

64% (1987)

58% (1941)

60% (1988)

70% (1984)

80% (1990)

40% (1990)

20% (1989)

58% (1983)

24% (1991)

40% (2000)