57% (1985)

37% (1973)

30% (1967)

69% (1979)

52% (1988)

69% (1963)

59% (1968)

48% (1988)

63% (1974)

53% (1976)

63% (1964)

63% (1965)

55% (1977)

62% (1973)

50% (1979)

70% (1962)

61% (1966)

30% (1979)

45% (1990)

64% (1988)