76% (1960)

75% (1973)

68% (2014)

70% (1973)

71% (1964)

61% (1979)

74% (1965)

64% (1970)

61% (1972)

54% (1971)

64% (1965)

72% (1966)

70% (1963)

70% (1983)

55% (1968)

69% (1967)

70% (1970)

65% (1970)

69% (1973)

61% (1980)