Year	Percent
2003-01-01	18.675
2004-01-01	19.800
2005-01-01	18.650
2006-01-01	17.525
2007-01-01	17.325
2008-01-01	18.100
2009-01-01	19.650
2010-01-01	19.600
2011-01-01	20.225
2012-01-01	20.125
2013-01-01	19.350
2014-01-01	17.850
2015-01-01	17.000
2016-01-01	16.200
2017-01-01	17.100