67% (1971)

53% (1975)

67% (1963)

65% (1971)

53% (1972)

58% (1965)

69% (1960)

62% (1969)

50% (1964)

69% (1975)

70% (1973)

67% (1962)

37% (1974)

49% (1973)

66% (1972)

61% (1973)

46% (1962)

62% (1976)

50% (1976)

63% (1974)