67% (1984)

58% (1975)

63% (1971)

71% (1984)

72% (1986)

71% (1968)

66% (1987)

54% (1973)

57% (1989)

0% (1968)

59% (1988)

67% (1983)

64% (1985)

70% (1988)

69% (1986)

55% (1974)

30% (1990)

80% (1961)

40% (1984)

73% (1975)