Year	Percent
1998-01-01	9.9000000000000000
1999-01-01	9.0000000000000000
2000-01-01	6.9000000000000000
2001-01-01	6.9000000000000000
2002-01-01	2.4000000000000000
2003-01-01	2.6000000000000000
2004-01-01	2.5000000000000000
2005-01-01	2.3000000000000000
2006-01-01	2.0000000000000000
2007-01-01	1.5000000000000000
2008-01-01	1.5000000000000000
2009-01-01	1.4000000000000000
2010-01-01	3.1000000000000000
2011-01-01	3.4189300000000005
2012-01-01	3.5010100000000000
2013-01-01	2.8608400000000000
2014-01-01	2.1510800000000000
2015-01-01	1.8447900000000002
2016-01-01	1.6065300000000000