74% (2001)

72% (1991)

61% (1994)

59% (1995)

78% (1993)

58% (1994)

74% (1989)

73% (1995)

63% (1992)

74% (1999)

76% (1991)

65% (1993)

53% (1990)

56% (1992)

68% (1996)

48% (1997)

59% (1991)

55% (1992)

69% (1988)

44% (1983)