72% (1967)

40% (1976)

79% (1984)

76% (1988)

78% (1981)

77% (1972)

73% (2002)

69% (1985)

56% (1979)

68% (1966)

73% (1964)

48% (1992)

78% (1978)

37% (1983)

73% (1984)

68% (1972)

50% (1977)

74% (1973)

62% (1972)

60% (1969)