64% (1995)

75% (1996)

79% (2000)

72% (2000)

50% (2000)

61% (1993)

72% (2000)

70% (1998)

70% (1999)

59% (1994)

56% (1993)

65% (1991)

56% (1993)

78% (2000)

67% (1998)

32% (2000)

57% (1988)

54% (1997)

59% (1995)

58% (1983)