72% (1991)

74% (2001)

58% (1994)

78% (1993)

61% (1994)

73% (1995)

58% (1995)

76% (1991)

74% (1999)

63% (1992)

65% (1993)

74% (1989)

47% (1997)

56% (1991)

55% (1992)

69% (1988)

59% (1991)

63% (2001)

58% (2000)

56% (1992)