Year	Percent
1998-01-01	10.7000000000000000
1999-01-01	13.6000000000000000
2000-01-01	11.0000000000000000
2001-01-01	9.7000000000000000
2002-01-01	8.7000000000000000
2003-01-01	6.8000000000000000
2004-01-01	3.3000000000000000
2005-01-01	2.7000000000000000
2006-01-01	2.7000000000000000
2007-01-01	3.2000000000000000
2008-01-01	3.9000000000000000
2009-01-01	4.0000000000000000
2010-01-01	2.8633800000000000
2011-01-01	2.4955400000000000
2012-01-01	2.7584400000000002
2013-01-01	2.7719900000000000
2014-01-01	2.9152600000000000
2015-01-01	2.8476700000000000
2016-01-01	3.1245400000000000