73% (2001)

62% (1992)

72% (1991)

58% (1995)

57% (1994)

77% (1993)

60% (1994)

75% (1991)

65% (1993)

73% (1999)

56% (1992)

73% (1995)

54% (1990)

73% (1989)

68% (1996)

54% (1992)

47% (1997)

59% (1991)

70% (1991)

62% (2001)