57% (1980)

73% (1979)

59% (1991)

74% (1982)

72% (1994)

50% (1983)

75% (1985)

50% (1979)

72% (1989)

77% (1988)

68% (1984)

58% (1998)

61% (1990)

47% (1994)

59% (1991)

69% (1981)

41% (1997)

83% (1981)

69% (2000)

57% (1997)