Year	Percent
1994-01-01	13.65517364902050
1995-01-01	13.11346042457990
1996-01-01	11.32877053674870
1997-01-01	11.87454948060540
1998-01-01	12.60392115860270
1999-01-01	16.35216523495850
2000-01-01	18.75749916420760
2001-01-01	19.30597272991640
2002-01-01	18.67132798835690
2003-01-01	17.55514839597380
2004-01-01	18.22449476194080
2005-01-01	16.25893357071960
2006-01-01	13.37261753896820
2007-01-01	11.14480733341770
2008-01-01	9.51219399277086
2009-01-01	12.01790786952710
2010-01-01	14.38102628557470
2011-01-01	13.61757908895200
2012-01-01	13.96334761620580
2013-01-01	14.22133053525390
2014-01-01	13.18427678528960
2015-01-01	11.48227072608140
2016-01-01	9.67168875524164
2017-01-01	8.13096551932692