80% (1979)

73% (1987)

64% (1975)

73% (1985)

70% (1978)

50% (1979)

80% (1981)

70% (1984)

57% (1975)

63% (1988)

68% (1981)

75% (1980)

70% (1977)

73% (1984)

70% (1987)

78% (1981)

70% (1984)

62% (1983)

70% (1981)

70% (1975)