Year	Percent
2000-01-01	49.925
2001-01-01	51.225
2002-01-01	51.850
2003-01-01	51.550
2004-01-01	51.175
2005-01-01	50.125
2006-01-01	49.425
2007-01-01	35.825
2008-01-01	38.150
2009-01-01	42.625
2010-01-01	48.275
2011-01-01	50.875
2012-01-01	51.350
2013-01-01	51.875
2014-01-01	54.175
2015-01-01	55.425
2016-01-01	51.600
2017-01-01	54.500