63% (1965)

71% (1968)

64% (1973)

67% (1963)

70% (1973)

50% (1964)

58% (1965)

59% (1965)

64% (1974)

55% (1976)

68% (1971)

57% (1964)

67% (1974)

52% (1961)

30% (1973)

41% (1972)

58% (1968)

49% (1973)

62% (1969)

46% (1962)