Year	Percent
1999-01-01	35.775
2000-01-01	35.625
2001-01-01	34.200
2002-01-01	34.375
2003-01-01	33.650
2004-01-01	38.875
2005-01-01	38.050
2006-01-01	39.225
2007-01-01	43.200
2008-01-01	42.950
2009-01-01	39.100
2010-01-01	37.625
2011-01-01	35.650
2012-01-01	30.400
2013-01-01	29.675
2014-01-01	29.475
2015-01-01	32.025
2016-01-01	31.050
2017-01-01	38.600