Year	Percent
1999-01-01	47.850
2000-01-01	47.800
2001-01-01	48.650
2002-01-01	48.225
2003-01-01	48.175
2004-01-01	47.475
2005-01-01	46.700
2006-01-01	46.875
2007-01-01	46.375
2008-01-01	46.325
2009-01-01	46.525
2010-01-01	45.925
2011-01-01	46.800
2012-01-01	46.750
2013-01-01	46.475
2014-01-01	46.525
2015-01-01	46.700
2016-01-01	46.900
2017-01-01	46.175