Year	Percent
2000-01-01	45.300
2001-01-01	46.800
2002-01-01	48.025
2003-01-01	48.975
2004-01-01	49.500
2005-01-01	51.600
2006-01-01	53.125
2007-01-01	53.900
2008-01-01	53.800
2009-01-01	51.250
2010-01-01	50.275
2011-01-01	50.125
2012-01-01	49.375
2013-01-01	51.300
2014-01-01	52.975
2015-01-01	55.650
2016-01-01	57.200
2017-01-01	58.650