Year	Percent
1999-01-01	44.375
2000-01-01	43.550
2001-01-01	43.025
2002-01-01	43.500
2003-01-01	43.175
2004-01-01	43.375
2005-01-01	44.600
2006-01-01	45.125
2007-01-01	45.200
2008-01-01	44.675
2009-01-01	45.375
2010-01-01	44.800
2011-01-01	45.375
2012-01-01	44.750
2013-01-01	44.325
2014-01-01	44.200
2015-01-01	43.150
2016-01-01	42.400
2017-01-01	42.125