Year	Percent
1998-01-01	8.4000000000000000
1999-01-01	11.4000000000000000
2000-01-01	10.4000000000000000
2001-01-01	10.1000000000000000
2002-01-01	8.8000000000000000
2003-01-01	5.4000000000000000
2004-01-01	2.8000000000000000
2005-01-01	1.9000000000000000
2006-01-01	2.0000000000000000
2007-01-01	2.1000000000000000
2008-01-01	1.4000000000000000
2009-01-01	3.3000000000000000
2010-01-01	2.9681900000000003
2011-01-01	2.2241200000000000
2012-01-01	1.6697900000000000
2013-01-01	1.3068400000000000
2014-01-01	1.0803399999999999
2015-01-01	1.2369900000000000
2016-01-01	1.3833600000000001