75% (1967)

78% (1971)

59% (1976)

62% (1983)

81% (1975)

77% (1979)

67% (1965)

78% (1974)

72% (1971)

58% (1967)

63% (1989)

70% (1989)

57% (1980)

75% (1972)

69% (2009)

45% (1986)

70% (1990)

56% (1989)

60% (1978)

62% (2004)