Year	Percent
2000-01-01	61.5127656788439
2001-01-01	62.2052019832103
2002-01-01	63.4055520529072
2003-01-01	63.0346024751476
2004-01-01	63.7670447926386
2005-01-01	63.7477536539311
2006-01-01	63.9732132447794
2007-01-01	64.1452068100399
2008-01-01	63.9557018915650
2009-01-01	63.0171000436665
2010-01-01	63.3878772302712
2011-01-01	63.9148390485728
2012-01-01	64.3436864813416
2013-01-01	64.6272682371432
2014-01-01	65.5662121309469
2015-01-01	65.9098049668321
2016-01-01	66.0756644418832
2017-01-01	66.6292640510155