Year	Percent
1998-01-01	14.9000000000000000
1999-01-01	12.6000000000000000
2000-01-01	12.4000000000000000
2001-01-01	12.1000000000000000
2002-01-01	10.9000000000000000
2003-01-01	9.5000000000000000
2004-01-01	10.5000000000000000
2005-01-01	11.0000000000000000
2006-01-01	8.5000000000000000
2007-01-01	9.7000000000000000
2008-01-01	10.2000000000000000
2009-01-01	9.5000000000000000
2010-01-01	5.7686800000000010
2011-01-01	7.3309399999999990
2012-01-01	7.5088300000000010
2013-01-01	7.0029900000000000
2014-01-01	6.9661100000000005
2015-01-01	7.1788100000000000
2016-01-01	7.9365300000000000