Year	Percent
1999-01-01	43.750
2000-01-01	45.600
2001-01-01	46.800
2002-01-01	47.750
2003-01-01	48.775
2004-01-01	49.900
2005-01-01	51.875
2006-01-01	53.050
2007-01-01	53.750
2008-01-01	52.675
2009-01-01	48.850
2010-01-01	47.775
2011-01-01	46.925
2012-01-01	44.925
2013-01-01	43.875
2014-01-01	44.525
2015-01-01	45.875
2016-01-01	47.050
2017-01-01	48.125