56% (2003)

75% (2000)

69% (1997)

70% (2001)

75% (2002)

76% (1994)

70% (1999)

75% (1998)

64% (2002)

62% (2001)

76% (2002)

74% (2002)

62% (2000)

64% (2002)

55% (1996)

70% (1995)

63% (2002)

73% (1993)

64% (1999)

60% (2001)