72% (1995)

76% (1973)

77% (1983)

69% (1973)

76% (1976)

73% (2002)

63% (1981)

60% (1995)

58% (1982)

65% (1967)

61% (1974)

64% (1979)

68% (1966)

67% (1977)

55% (1993)

67% (1998)

74% (1976)

65% (1967)

55% (1977)

59% (1978)