63% (2006)

61% (1999)

68% (2009)

64% (2010)

65% (2007)

67% (2008)

69% (2001)

69% (2006)

74% (2011)

64% (2008)

69% (2012)

72% (2003)

77% (1993)

64% (2008)

67% (2005)

60% (2016)

64% (2017)

61% (2018)

67% (2004)

78% (1990)