69% (2007)

57% (2008)

72% (2004)

56% (2005)

63% (1999)

63% (2004)

63% (2003)

70% (2006)

59% (2009)

60% (2002)

73% (2009)

62% (2011)

65% (2005)

69% (2010)

60% (1999)

62% (2009)

49% (2000)

50% (1999)

59% (2005)

70% (2013)