Year	Percent
1999-01-01	43.400
2000-01-01	43.400
2001-01-01	42.350
2002-01-01	43.225
2003-01-01	43.625
2004-01-01	44.475
2005-01-01	45.675
2006-01-01	45.825
2007-01-01	46.550
2008-01-01	46.925
2009-01-01	46.950
2010-01-01	47.700
2011-01-01	47.050
2012-01-01	47.100
2013-01-01	47.750
2014-01-01	48.075
2015-01-01	48.000
2016-01-01	47.800
2017-01-01	48.725