Year	Percent
1999-01-01	30.300
2000-01-01	32.225
2001-01-01	34.275
2002-01-01	33.600
2003-01-01	36.500
2004-01-01	34.000
2005-01-01	33.775
2006-01-01	30.675
2007-01-01	30.850
2008-01-01	28.550
2009-01-01	29.950
2010-01-01	32.575
2011-01-01	32.900
2012-01-01	35.975
2013-01-01	37.550
2014-01-01	38.000
2015-01-01	37.500
2016-01-01	32.625
2017-01-01	35.900