64% (1967)

53% (1973)

64% (1964)

53% (1975)

61% (1962)

54% (1974)

65% (1975)

63% (1972)

72% (1974)

58% (1964)

60% (1973)

61% (1970)

10% (1964)

48% (1967)

62% (1973)

35% (1976)

45% (1972)

46% (1975)