75% (1993)

58% (1998)

77% (1988)

56% (1996)

43% (1992)

75% (1985)

70% (1988)

50% (1994)

53% (1980)

70% (1989)

45% (1992)

57% (1990)

38% (1994)

69% (2000)

50% (1990)

52% (1980)

62% (1983)

52% (1996)

47% (1994)

65% (1991)