73% (1995)

77% (1973)

76% (1976)

72% (2002)

77% (1983)

67% (1977)

64% (1981)

70% (1966)

61% (1974)

58% (1982)

69% (1973)

60% (1995)

61% (1970)

65% (1967)

68% (1998)

52% (1970)

58% (1968)

61% (1978)

55% (1988)

48% (1984)