Year	Percent
1999-01-01	50.975
2000-01-01	51.050
2001-01-01	50.400
2002-01-01	49.475
2003-01-01	48.875
2004-01-01	49.650
2005-01-01	48.700
2006-01-01	48.025
2007-01-01	47.150
2008-01-01	46.625
2009-01-01	45.925
2010-01-01	45.875
2011-01-01	45.475
2012-01-01	44.975
2013-01-01	44.700
2014-01-01	44.700
2015-01-01	44.650
2016-01-01	44.075
2017-01-01	44.100