73% (1995)

77% (1973)

64% (1981)

69% (1973)

76% (1976)

73% (2002)

55% (1988)

77% (1983)

58% (1982)

65% (1967)

67% (1977)

57% (1972)

61% (1995)

58% (1968)

62% (1974)

61% (1969)

63% (1979)

55% (1977)

70% (1966)

61% (1978)