56% (2003)

74% (2000)

75% (2002)

69% (1997)

65% (2001)

74% (2002)

75% (1998)

76% (2002)

55% (1996)

70% (1995)

69% (2001)

60% (1995)

76% (1994)

64% (2002)

70% (1999)

61% (2000)

61% (2002)

64% (1999)

60% (2001)

48% (1997)