69% (1986)

53% (1983)

72% (1993)

57% (1996)

55% (1987)

50% (1982)

52% (1997)

54% (1991)

55% (1977)

57% (1980)

32% (1991)

40% (1987)

55% (1992)

73% (1989)

50% (1988)

31% (1997)

38% (1981)

52% (1999)

27% (1996)

39% (1980)