59% (1976)

62% (1983)

72% (1971)

75% (1967)

58% (1967)

77% (1979)

67% (1965)

72% (1976)

77% (1974)

57% (1980)

72% (1975)

78% (1971)

70% (1989)

68% (1988)

78% (1974)

67% (1973)

75% (1972)

69% (2009)

71% (1976)

70% (1990)