Year	Percent
2005-01-01	52.1140766552513
2006-01-01	51.6208586074425
2007-01-01	51.6347216176735
2008-01-01	52.2480327707346
2009-01-01	53.0705046310048
2010-01-01	52.9158918818279
2011-01-01	53.1163442662113
2012-01-01	52.7417530261184
2013-01-01	53.6316445524454
2014-01-01	54.4383377862991
2015-01-01	55.1836088379811
2016-01-01	55.7756909082118
2017-01-01	56.2246824298958