Year	Percent
2005-01-01	17.3229472880851
2006-01-01	16.4226219973883
2007-01-01	16.1122246888415
2008-01-01	17.8166318752313
2009-01-01	21.4876904564130
2010-01-01	16.6095928725327
2011-01-01	15.1950134679842
2012-01-01	14.3430597986332
2013-01-01	13.9156372809596
2014-01-01	14.2948856461947
2015-01-01	13.8088221775088
2016-01-01	14.4397485334896
2017-01-01	15.6975100861090