Year	Percent
2000-01-01	71.3227137409762
2001-01-01	72.0162044071214
2002-01-01	73.8855710424386
2003-01-01	72.7119533688675
2004-01-01	73.8377296937415
2005-01-01	74.5619577660149
2006-01-01	74.9726314704972
2007-01-01	76.8402213542936
2008-01-01	76.2513666869614
2009-01-01	76.4747911374396
2010-01-01	77.6165925355879
2011-01-01	78.8765809258266
2012-01-01	79.5593860827878
2013-01-01	80.3967738281074
2014-01-01	82.0661272208959
2015-01-01	81.8027218108719
2016-01-01	81.7156532378129
2017-01-01	82.7377412545692