Year	Percent
2000-01-01	38.7985063804984
2001-01-01	38.5095961057978
2002-01-01	37.9105567768500
2003-01-01	38.4065399440411
2004-01-01	37.6697081652055
2005-01-01	37.7797095333535
2006-01-01	37.8146374220351
2007-01-01	37.8482789982510
2008-01-01	38.2775942993027
2009-01-01	39.0057310970975
2010-01-01	38.8699888936465
2011-01-01	38.6560924357397
2012-01-01	38.4076002009543
2013-01-01	38.2873150391133
2014-01-01	37.2937292869730
2015-01-01	37.2027980109600
2016-01-01	37.1230523148040
2017-01-01	36.8377834418940