64% (1975)

73% (1987)

80% (1979)

75% (1980)

64% (1987)

37% (1976)

73% (1985)

70% (1975)

65% (1984)

70% (1984)

73% (1978)

63% (1988)

68% (1975)

50% (1979)

65% (1976)

70% (1978)

60% (1989)

75% (1984)

81% (1981)

65% (1988)