57% (2003)

43% (2005)

55% (2006)

65% (2007)

46% (2005)

44% (2006)

52% (2010)

61% (2004)

55% (2007)

46% (2002)

44% (2009)

40% (2003)

59% (2001)

53% (2010)

54% (2007)

48% (2000)