75% (1960)

70% (1964)

68% (2014)

75% (1973)

61% (1979)

64% (1965)

64% (1970)

60% (1972)

69% (1967)

70% (1963)

74% (1965)

55% (1968)

68% (1973)

70% (1983)

80% (1965)

70% (1970)

63% (1970)

70% (1973)

65% (1970)

72% (1966)