72% (1991)

58% (1995)

57% (1994)

73% (2001)

56% (1992)

60% (1994)

73% (1999)

73% (1995)

77% (1993)

76% (1991)

56% (1991)

73% (1989)

65% (1993)

47% (1997)

68% (1996)

53% (1990)

66% (2002)

62% (1992)

62% (2001)

55% (1998)