Year	Percent
2005-01-01	19.100
2006-01-01	18.800
2007-01-01	18.400
2008-01-01	17.700
2009-01-01	17.500
2010-01-01	18.725
2011-01-01	17.925
2012-01-01	17.700
2013-01-01	17.600
2014-01-01	17.100
2015-01-01	16.700
2016-01-01	16.125
2017-01-01	16.050