67% (2007)

75% (2011)

70% (2007)

62% (2012)

69% (2011)

75% (2006)

55% (2005)

65% (2009)

63% (2010)

65% (2011)

60% (2004)

54% (2005)

71% (2010)

62% (2006)

71% (2006)

64% (2011)

59% (2007)

60% (2008)

65% (2012)

69% (2009)