70% (1966)

70% (1969)

64% (1960)

58% (1965)

37% (1971)

64% (1965)

62% (1958)

56% (1971)

48% (1962)

60% (1963)

40% (1973)

63% (1961)

52% (1964)

72% (1966)

61% (1966)

62% (1964)

58% (1953)

60% (1958)

72% (1970)

59% (1968)