53% (1983)

69% (1986)

55% (1987)

31% (1997)

73% (1989)

55% (1992)

50% (1982)

52% (1999)

54% (1991)

50% (1988)

32% (1991)

39% (1980)

38% (1981)

74% (1992)

72% (1993)

55% (1977)

40% (1987)

57% (1980)

27% (1996)

52% (1984)