Year	Percent
2000-01-01	13.700
2001-01-01	13.200
2002-01-01	13.625
2003-01-01	13.825
2004-01-01	13.175
2005-01-01	14.300
2006-01-01	15.650
2007-01-01	15.850
2008-01-01	17.000
2009-01-01	21.875
2010-01-01	21.975
2011-01-01	23.750
2012-01-01	23.925
2013-01-01	22.975
2014-01-01	18.950
2015-01-01	16.200
2016-01-01	14.750
2017-01-01	13.475