Year	Percent
1998-01-01	2.4000000000000000
1999-01-01	2.2000000000000000
2000-01-01	2.6000000000000000
2001-01-01	2.5000000000000000
2002-01-01	3.8000000000000000
2003-01-01	8.7000000000000000
2004-01-01	7.3000000000000000
2005-01-01	5.9000000000000000
2006-01-01	4.5000000000000000
2007-01-01	4.0000000000000000
2008-01-01	3.7000000000000000
2009-01-01	4.3000000000000000
2010-01-01	3.1291900000000004
2011-01-01	2.8706400000000003
2012-01-01	3.4548600000000000
2013-01-01	2.2518000000000000
2014-01-01	1.5364900000000000
2015-01-01	1.7259500000000000
2016-01-01	1.7369900000000003