Year	Percent
1999-01-01	48.850
2000-01-01	48.475
2001-01-01	48.400
2002-01-01	48.825
2003-01-01	49.975
2004-01-01	47.550
2005-01-01	47.125
2006-01-01	46.750
2007-01-01	46.675
2008-01-01	46.450
2009-01-01	46.375
2010-01-01	46.750
2011-01-01	47.700
2012-01-01	47.750
2013-01-01	48.400
2014-01-01	47.775
2015-01-01	48.100
2016-01-01	47.975
2017-01-01	46.200