Year	Percent
2005-01-01	27.5035289796231
2006-01-01	26.7261266611545
2007-01-01	26.0639676263272
2008-01-01	24.7226260476268
2009-01-01	24.3791221845480
2010-01-01	22.4273233022385
2011-01-01	21.0238442686972
2012-01-01	21.1279481511704
2013-01-01	20.8255606684118
2014-01-01	20.7400143348508
2015-01-01	20.5863200166022
2016-01-01	20.3668890277738
2017-01-01	20.1083226737113