69% (1973)

68% (2014)

75% (1960)

74% (1973)

71% (1964)

74% (1965)

70% (1983)

69% (1967)

61% (1972)

60% (1979)

64% (1970)

56% (1971)

63% (1965)

61% (1965)

70% (1963)

71% (1967)

70% (1970)

54% (1968)

66% (1976)

54% (1980)