53% (1976)

46% (1986)

44% (1973)

70% (1968)

60% (1968)

69% (1963)

62% (1971)

51% (1968)

53% (1973)

58% (1976)

53% (1971)

59% (1973)

64% (1972)

52% (1962)

47% (1966)

70% (1967)

63% (1970)

59% (1965)

48% (1966)

35% (1972)