56% (2003)

75% (1995)

75% (2000)

74% (2002)

75% (1998)

69% (1997)

76% (1994)

73% (1993)

70% (1995)

72% (2003)

61% (2001)

70% (2001)

64% (1999)

61% (2000)

63% (2002)

65% (2002)

70% (1999)

55% (1996)

65% (2001)

71% (1994)