71% (1968)

69% (1963)

46% (1986)

62% (1971)

59% (1973)

53% (1976)

64% (1972)

53% (1973)

43% (1973)

59% (1968)

48% (1966)

57% (1976)

63% (1970)

55% (1970)

47% (1972)

48% (1968)

52% (1968)

53% (1970)

70% (1967)

35% (1972)