Year	Percent
2000-01-01	42.850
2001-01-01	43.975
2002-01-01	45.600
2003-01-01	47.225
2004-01-01	47.850
2005-01-01	48.875
2006-01-01	50.150
2007-01-01	49.950
2008-01-01	50.200
2009-01-01	50.650
2010-01-01	51.125
2011-01-01	51.275
2012-01-01	52.975
2013-01-01	55.275
2014-01-01	56.400
2015-01-01	57.700
2016-01-01	59.250
2017-01-01	60.900