Year	Percent
2000-01-01	40.4152216514065
2001-01-01	40.2767474116363
2002-01-01	39.4808733636985
2003-01-01	41.0524442358640
2004-01-01	39.8983087140192
2005-01-01	39.5174094685978
2006-01-01	38.6519024922550
2007-01-01	37.4713997134646
2008-01-01	37.9229756992418
2009-01-01	37.9355635521944
2010-01-01	37.2160949324325
2011-01-01	36.3789610628145
2012-01-01	35.2621308089151
2013-01-01	34.2475498836730
2014-01-01	32.5659194509345
2015-01-01	32.1157920813829
2016-01-01	31.9567734516293
2017-01-01	30.8640870862560