78% (2001)

49% (1996)

48% (2005)

47% (2006)

48% (2004)

74% (2002)

72% (1999)

71% (1999)

74% (2006)

62% (1998)

49% (2003)

65% (2004)

40% (1996)

36% (1992)

70% (2000)

50% (1999)

49% (2007)

50% (1994)

66% (1994)

81% (2000)