Year	Percent
2001-01-01	51.3281944445795
2002-01-01	50.8950350770043
2003-01-01	50.5138155392001
2004-01-01	50.0658867725435
2005-01-01	50.7541568331784
2006-01-01	51.7479455487406
2007-01-01	52.6432722637198
2008-01-01	53.0346588208872
2009-01-01	50.9715485458926
2010-01-01	51.3214289054085
2011-01-01	51.9403255954064
2012-01-01	51.8004809404285
2013-01-01	52.1026174983406
2014-01-01	52.5345808525740