Year	Percent
1999-01-01	43.175
2000-01-01	41.725
2001-01-01	40.500
2002-01-01	40.450
2003-01-01	39.875
2004-01-01	45.100
2005-01-01	44.525
2006-01-01	44.400
2007-01-01	47.650
2008-01-01	47.650
2009-01-01	45.325
2010-01-01	44.375
2011-01-01	41.950
2012-01-01	38.175
2013-01-01	37.125
2014-01-01	36.575
2015-01-01	38.900
2016-01-01	36.825
2017-01-01	42.850