Year	Percent
1999-01-01	34.950
2000-01-01	33.525
2001-01-01	30.675
2002-01-01	28.500
2003-01-01	26.850
2004-01-01	23.600
2005-01-01	21.825
2006-01-01	21.575
2007-01-01	21.075
2008-01-01	20.225
2009-01-01	18.150
2010-01-01	18.250
2011-01-01	17.975
2012-01-01	18.475
2013-01-01	20.100
2014-01-01	23.525
2015-01-01	25.650
2016-01-01	28.125
2017-01-01	28.975