69% (1964)

72% (1958)

68% (1967)

68% (1965)

67% (1959)

62% (1971)

70% (1970)

50% (1973)

61% (1976)

63% (1953)

0% (1994)

59% (1958)

58% (1961)

63% (1968)

60% (1963)

57% (1968)

76% (1967)

60% (1968)

55% (1971)

48% (1976)