81% (1979)

82% (1986)

72% (1976)

65% (1982)

50% (1989)

72% (1990)

66% (1978)

67% (1977)

64% (1980)

53% (1981)

60% (1979)

67% (1988)

70% (1988)

58% (1983)

60% (1977)

77% (1987)

60% (1976)

85% (1985)

60% (1980)

10% (1988)