54% (1983)

57% (1980)

69% (1986)

31% (1997)

74% (1992)

38% (1991)

54% (1977)

54% (1991)

52% (1999)

55% (1987)

58% (1993)

58% (1992)

40% (1987)

37% (1981)

42% (1980)

73% (1989)

72% (1993)

69% (1981)

50% (1988)

27% (1996)