Year	Percent
1999-01-01	11.325
2000-01-01	10.950
2001-01-01	10.025
2002-01-01	11.900
2003-01-01	12.850
2004-01-01	14.475
2005-01-01	19.025
2006-01-01	19.775
2007-01-01	18.825
2008-01-01	20.375
2009-01-01	24.500
2010-01-01	24.650
2011-01-01	24.650
2012-01-01	27.100
2013-01-01	27.900
2014-01-01	21.000
2015-01-01	15.975
2016-01-01	12.925
2017-01-01	12.050