Year	Percent
2001-01-01	12.600
2002-01-01	13.900
2003-01-01	14.600
2004-01-01	18.050
2005-01-01	21.725
2006-01-01	20.925
2007-01-01	18.825
2008-01-01	19.650
2009-01-01	26.175
2010-01-01	25.900
2011-01-01	23.275
2012-01-01	24.975
2013-01-01	24.750
2014-01-01	24.175
2015-01-01	21.150
2016-01-01	20.400
2017-01-01	18.750