Year	Percent
1999-01-01	6.26826794658351
2000-01-01	5.63053021267634
2001-01-01	4.97001767769478
2002-01-01	5.43721836574430
2003-01-01	5.57586032895649
2004-01-01	6.09231352608555
2005-01-01	7.42546640099908
2006-01-01	7.91175152390416
2007-01-01	7.73233702765636
2008-01-01	8.00346286066235
2009-01-01	9.73815519177438
2010-01-01	10.66367686219600
2011-01-01	10.98448614932400
2012-01-01	10.61538621827100
2013-01-01	10.13841670138300
2014-01-01	7.91666103200279
2015-01-01	7.04178905665710
2016-01-01	5.11062766702716
2017-01-01	4.57142065035279