67% (1998)

52% (1986)

38% (1995)

50% (1981)

50% (1980)

50% (1994)

40% (1991)

57% (1996)

59% (1984)

50% (1984)

55% (1981)

37% (1991)

45% (1986)

50% (1993)

48% (1979)

40% (1993)

43% (1992)

71% (1989)

53% (1980)

55% (1999)