68% (2007)

58% (2008)

63% (2004)

71% (2004)

58% (2009)

72% (2009)

68% (2012)

59% (2005)

62% (2003)

70% (2006)

62% (2011)

60% (2002)

60% (2007)

62% (2009)

60% (1999)

50% (1998)

55% (2007)

80% (2002)

50% (2009)

70% (2013)