Year	Percent
2000-01-01	50.425
2001-01-01	49.350
2002-01-01	47.550
2003-01-01	47.500
2004-01-01	47.725
2005-01-01	48.700
2006-01-01	50.250
2007-01-01	63.025
2008-01-01	57.075
2009-01-01	45.300
2010-01-01	38.700
2011-01-01	36.150
2012-01-01	34.825
2013-01-01	36.550
2014-01-01	36.800
2015-01-01	37.850
2016-01-01	42.075
2017-01-01	39.975