76% (1997)

77% (1996)

75% (1999)

67% (1992)

71% (1990)

62% (2002)

74% (2002)

60% (1997)

40% (1996)

66% (1993)

59% (1993)

58% (1997)

58% (1998)

60% (1996)

65% (1998)

70% (1998)

59% (2002)

58% (1995)

68% (1993)

55% (1995)