Year	Percent
1998-01-01	5.3000000000000000
1999-01-01	8.9000000000000000
2000-01-01	16.0000000000000000
2001-01-01	13.1000000000000000
2002-01-01	18.1000000000000000
2003-01-01	17.7000000000000000
2004-01-01	10.7000000000000000
2005-01-01	5.2000000000000000
2006-01-01	3.4000000000000000
2007-01-01	2.7000000000000000
2008-01-01	3.1000000000000000
2009-01-01	3.5000000000000000
2010-01-01	2.1170200000000000
2011-01-01	1.3956000000000000
2012-01-01	1.7345500000000000
2013-01-01	1.7325800000000000
2014-01-01	1.9900600000000000
2015-01-01	1.7368400000000002
2016-01-01	1.8366099999999999