54% (1983)

72% (1993)

55% (1977)

69% (1986)

50% (1988)

47% (1982)

73% (1989)

55% (1987)

54% (1990)

74% (1992)

39% (1980)

54% (1991)

57% (1980)

55% (1992)

52% (1999)

38% (1981)

60% (1995)

40% (1987)

69% (1981)

50% (1982)