Year	Percent
2000-01-01	42.1801189232611
2001-01-01	41.5704380606845
2002-01-01	40.9255228658901
2003-01-01	41.5608335861872
2004-01-01	40.2175654106782
2005-01-01	39.6054172354634
2006-01-01	38.4524117111411
2007-01-01	37.9773834893378
2008-01-01	37.6985140064568
2009-01-01	38.4567280990781
2010-01-01	37.8266876679262
2011-01-01	37.2631725252855
2012-01-01	37.1558082881431
2013-01-01	36.6040786956303
2014-01-01	35.2469938655787
2015-01-01	34.6209625367537
2016-01-01	34.0552137600604
2017-01-01	33.3592188354830