72% (1986)

74% (1984)

68% (1983)

72% (1985)

64% (1980)

73% (1986)

53% (1988)

67% (1983)

43% (1989)

71% (1994)

50% (1979)

67% (1980)

65% (1988)

36% (1983)

70% (1996)

63% (1984)

63% (1978)

70% (1986)

50% (1979)

50% (1981)