52% (2006)

38% (2007)

60% (2010)

36% (2011)

59% (2009)

60% (2004)

35% (2004)

47% (2008)

49% (2004)

54% (2007)

44% (2004)

42% (2010)

51% (2010)

53% (2004)

20% (2002)