73% (1987)

80% (1979)

64% (1975)

57% (1975)

70% (1975)

73% (1985)

72% (1978)

67% (1989)

68% (1981)

48% (1979)

75% (1980)

68% (1975)

70% (1981)

70% (1977)

70% (1981)

58% (1973)

50% (1979)

78% (1981)

57% (1981)

70% (1978)