67% (2008)

72% (2011)

62% (2014)

65% (2017)

74% (2013)

78% (2010)

59% (2010)

72% (2015)

60% (2009)

58% (2006)

67% (2010)

62% (2009)

58% (2003)

59% (2010)

55% (2007)

59% (2005)

70% (2007)

61% (2001)

50% (2011)

48% (1999)