Year	Percent
2000-01-01	47.475
2001-01-01	46.150
2002-01-01	44.400
2003-01-01	44.000
2004-01-01	44.350
2005-01-01	45.150
2006-01-01	46.525
2007-01-01	48.575
2008-01-01	50.375
2009-01-01	50.425
2010-01-01	49.975
2011-01-01	50.200
2012-01-01	50.250
2013-01-01	50.150
2014-01-01	51.200
2015-01-01	51.925
2016-01-01	52.750
2017-01-01	53.700