76% (1960)

70% (1964)

75% (1973)

61% (1979)

68% (2014)

64% (1970)

74% (1965)

69% (1967)

63% (1965)

61% (1972)

69% (1973)

80% (1965)

70% (1983)

72% (1966)

70% (1963)

54% (1968)

63% (1970)

70% (1970)

50% (1997)

65% (1970)