Year	Percent
1999-01-01	45.300
2000-01-01	49.450
2001-01-01	50.275
2002-01-01	49.700
2003-01-01	50.225
2004-01-01	47.050
2005-01-01	45.900
2006-01-01	45.950
2007-01-01	43.975
2008-01-01	43.850
2009-01-01	43.800
2010-01-01	46.025
2011-01-01	45.175
2012-01-01	44.625
2013-01-01	44.700
2014-01-01	44.625
2015-01-01	45.850
2016-01-01	45.375
2017-01-01	46.275