57% (1982)

55% (1986)

72% (1976)

63% (1978)

58% (1983)

70% (1988)

77% (1987)

48% (1985)

70% (1983)

63% (1979)

52% (1989)

67% (1988)

63% (1981)

67% (1986)

67% (1988)

50% (1981)

60% (1977)

73% (1983)

85% (1985)

70% (1986)