Year	Percent
2005-01-01	38.2373842764521
2006-01-01	38.3026234242140
2007-01-01	38.8521541273698
2008-01-01	39.6178489296865
2009-01-01	38.9450181252228
2010-01-01	41.7139515432910
2011-01-01	43.3594065864543
2012-01-01	43.7006397000734
2013-01-01	44.1402773805145
2014-01-01	44.3096687540021
2015-01-01	44.4876891842929
2016-01-01	44.3972908671873
2017-01-01	44.6796884836965