Year	Percent
2005-01-01	23.3385812534034
2006-01-01	22.6318871247898
2007-01-01	22.6126399062825
2008-01-01	21.9338283497041
2009-01-01	22.6674566891168
2010-01-01	22.1571094052095
2011-01-01	21.4466193399975
2012-01-01	21.9693272476864
2013-01-01	21.9278181573836
2014-01-01	22.3756928509447
2015-01-01	22.3008158373151
2016-01-01	22.6482910158578
2017-01-01	22.3716757484654