72% (1991)

74% (2001)

73% (1995)

58% (1994)

58% (1995)

61% (1994)

78% (1993)

73% (1999)

76% (1991)

65% (1993)

63% (1992)

74% (1989)

47% (1997)

54% (1990)

63% (2001)

58% (2000)

69% (1988)

55% (1992)

56% (1992)

59% (1991)