Year	Percent
2000-01-01	52.0626175571395
2001-01-01	52.8515875213429
2002-01-01	53.5502253767217
2003-01-01	52.9988872833984
2004-01-01	54.2611387444365
2005-01-01	54.5414446063894
2006-01-01	54.9209008739444
2007-01-01	54.9181440355327
2008-01-01	54.8290707393512
2009-01-01	54.0061485058257
2010-01-01	54.5443956710194
2011-01-01	54.8927762858444
2012-01-01	55.2359423610329
2013-01-01	55.6299242803918
2014-01-01	57.0664681081548
2015-01-01	57.8507363129577
2016-01-01	58.2998395810046
2017-01-01	58.9995490206778