Year	Percent
1999-01-01	30.475
2000-01-01	32.500
2001-01-01	34.000
2002-01-01	34.400
2003-01-01	34.675
2004-01-01	35.350
2005-01-01	38.500
2006-01-01	39.550
2007-01-01	39.225
2008-01-01	36.025
2009-01-01	28.025
2010-01-01	24.975
2011-01-01	22.000
2012-01-01	18.400
2013-01-01	16.825
2014-01-01	16.700
2015-01-01	17.925
2016-01-01	18.350
2017-01-01	20.475