73% (1995)

76% (1973)

67% (1977)

64% (1981)

69% (1973)

73% (2002)

76% (1976)

77% (1983)

52% (1969)

61% (1970)

65% (1967)

55% (1977)

68% (1998)

58% (1982)

63% (1979)

61% (1974)

55% (1988)

61% (1969)

60% (1995)

52% (1970)