69% (1986)

73% (1992)

30% (1991)

55% (1987)

57% (1980)

54% (1983)

47% (1982)

54% (1991)

73% (1989)

31% (1997)

52% (1999)

50% (1988)

54% (1977)

58% (1993)

73% (1993)

39% (1980)

50% (1982)

60% (1995)

57% (1996)

52% (1997)