53% (1975)

63% (1973)

64% (1974)

68% (1974)

62% (1969)

58% (1973)

66% (1972)

53% (1972)

70% (1973)

69% (1960)

68% (1962)

50% (1964)

75% (1962)

63% (1971)

55% (1976)

58% (1971)

49% (1973)

55% (1973)

52% (1961)

59% (1965)