Year	Percent
2000-01-01	36.675
2001-01-01	35.575
2002-01-01	34.550
2003-01-01	35.200
2004-01-01	34.150
2005-01-01	35.875
2006-01-01	38.400
2007-01-01	41.425
2008-01-01	44.050
2009-01-01	44.275
2010-01-01	45.225
2011-01-01	47.825
2012-01-01	49.225
2013-01-01	51.300
2014-01-01	53.125
2015-01-01	54.150
2016-01-01	55.675
2017-01-01	58.300