Year	Percent
1999-01-01	13.675
2000-01-01	14.125
2001-01-01	16.250
2002-01-01	14.475
2003-01-01	14.950
2004-01-01	18.100
2005-01-01	18.950
2006-01-01	21.425
2007-01-01	23.025
2008-01-01	22.150
2009-01-01	25.575
2010-01-01	25.475
2011-01-01	23.725
2012-01-01	26.475
2013-01-01	26.975
2014-01-01	31.100
2015-01-01	32.925
2016-01-01	35.200
2017-01-01	39.525