47% (1986)

70% (1968)

44% (1973)

53% (1976)

53% (1973)

62% (1971)

63% (1970)

57% (1976)

48% (1966)

59% (1973)

48% (1968)

69% (1963)

64% (1972)

61% (1970)

53% (1971)

47% (1972)

52% (1968)

52% (1962)

0% (1967)

55% (1970)