76% (1997)

79% (1999)

78% (1994)

68% (1998)

72% (1997)

76% (2000)

71% (1996)

68% (2001)

70% (2003)

64% (2002)

70% (1999)

49% (2006)

58% (2006)

60% (2000)

53% (2005)

58% (1996)

67% (2000)

66% (1997)

80% (1998)

58% (2004)