68% (2012)

61% (2002)

71% (2004)

70% (2009)

75% (2007)

62% (2005)

57% (2008)

75% (2007)

56% (2009)

57% (2008)

50% (2008)

59% (2002)

63% (2008)

68% (2009)

58% (2010)

57% (2006)

58% (2009)

70% (2009)

68% (2007)

62% (2008)