Year	Percent
1999-01-01	25.025
2000-01-01	26.550
2001-01-01	29.725
2002-01-01	29.300
2003-01-01	32.275
2004-01-01	30.250
2005-01-01	29.975
2006-01-01	29.475
2007-01-01	27.975
2008-01-01	27.200
2009-01-01	28.225
2010-01-01	32.450
2011-01-01	32.875
2012-01-01	35.900
2013-01-01	38.925
2014-01-01	38.950
2015-01-01	38.275
2016-01-01	35.000
2017-01-01	37.525