68% (1997)

56% (1992)

58% (1998)

73% (1995)

75% (1998)

70% (1998)

73% (1994)

80% (1990)

77% (1998)

72% (1998)

83% (1999)

75% (1999)

78% (1999)

78% (1999)

100% (1994)

57% (1999)

70% (1999)

73% (1990)

68% (1998)

55% (1996)