Year	Percent
2005-01-01	59.3270868114400
2006-01-01	60.1300907068127
2007-01-01	60.1116379389140
2008-01-01	59.9555008070193
2009-01-01	59.9016080877354
2010-01-01	59.6775738870364
2011-01-01	59.7674008360010
2012-01-01	60.4299428394709
2013-01-01	60.2940084661385
2014-01-01	59.7744133468643
2015-01-01	59.8072435804870
2016-01-01	59.6912765793279
2017-01-01	59.3494586052294