57% (1980)

73% (1979)

52% (1989)

74% (1982)

53% (1980)

77% (1982)

60% (1991)

72% (1994)

58% (1998)

45% (1986)

50% (1983)

83% (1981)

69% (2000)

56% (1991)

59% (1984)

69% (1984)

53% (1993)

52% (1996)

75% (1993)

77% (1988)