Year	Percent
2000-01-01	45.800
2001-01-01	46.200
2002-01-01	46.775
2003-01-01	47.775
2004-01-01	48.300
2005-01-01	49.925
2006-01-01	51.725
2007-01-01	52.025
2008-01-01	51.950
2009-01-01	49.050
2010-01-01	47.325
2011-01-01	49.225
2012-01-01	50.350
2013-01-01	50.875
2014-01-01	50.875
2015-01-01	52.500
2016-01-01	52.950
2017-01-01	54.050