52% (1996)

57% (1980)

73% (1979)

58% (1998)

50% (1983)

73% (1982)

59% (1991)

53% (1989)

77% (1982)

41% (1997)

69% (1981)

61% (1990)

38% (1995)

35% (1987)

71% (1989)

57% (1997)

43% (1992)

62% (1984)

57% (1995)

60% (1991)