Year	Percent
2000-01-01	45.825
2001-01-01	46.850
2002-01-01	48.025
2003-01-01	47.700
2004-01-01	47.575
2005-01-01	46.725
2006-01-01	45.050
2007-01-01	30.650
2008-01-01	34.050
2009-01-01	39.950
2010-01-01	46.125
2011-01-01	48.625
2012-01-01	49.700
2013-01-01	50.100
2014-01-01	51.975
2015-01-01	52.550
2016-01-01	49.425
2017-01-01	53.275