64% (1987)

75% (1984)

50% (1979)

70% (1977)

63% (1987)

63% (1984)

78% (1981)

63% (1977)

37% (1976)

73% (1983)

73% (1987)

70% (1975)

48% (1982)

58% (1973)

63% (1989)

57% (1981)

70% (1981)

54% (1985)

65% (1988)

72% (1987)