Year	Percent
2005-01-01	50.0198801718105
2006-01-01	51.5713894240974
2007-01-01	52.2712206068836
2008-01-01	52.3907118856270
2009-01-01	53.5223357877760
2010-01-01	53.2133729783038
2011-01-01	53.8863094847053
2012-01-01	55.2009663702415
2013-01-01	55.5372513774553
2014-01-01	54.5802759870974
2015-01-01	55.2306158749120
2016-01-01	55.4846296667173
2017-01-01	55.2577819329980