73% (1995)

77% (1973)

76% (1976)

72% (2002)

70% (1966)

77% (1983)

69% (1973)

67% (1977)

64% (1981)

65% (1967)

61% (1970)

61% (1974)

58% (1968)

51% (1990)

58% (1982)

60% (1995)

63% (1979)

61% (1978)

61% (1969)

52% (1969)