72% (1991)

73% (2001)

57% (1994)

78% (1993)

58% (1995)

60% (1994)

74% (1999)

62% (1992)

73% (1995)

73% (1989)

65% (1993)

75% (1991)

54% (1990)

59% (1991)

48% (1997)

56% (1992)

62% (2001)

70% (1991)

68% (1996)

73% (1988)