Year	Percent
2005-01-01	18.700
2006-01-01	18.800
2007-01-01	18.100
2008-01-01	16.400
2009-01-01	16.100
2010-01-01	18.050
2011-01-01	17.150
2012-01-01	16.400
2013-01-01	16.450
2014-01-01	15.250
2015-01-01	15.175
2016-01-01	14.475
2017-01-01	14.450