Year	Percent
1998-01-01	5.4000000000000000
1999-01-01	5.8000000000000000
2000-01-01	5.3000000000000000
2001-01-01	8.4000000000000000
2002-01-01	7.2000000000000000
2003-01-01	5.2000000000000000
2004-01-01	2.9000000000000000
2005-01-01	1.8000000000000000
2006-01-01	1.8000000000000000
2007-01-01	1.5000000000000000
2008-01-01	2.4000000000000000
2009-01-01	2.4000000000000000
2010-01-01	2.4565000000000000
2011-01-01	2.4474099999999996
2012-01-01	2.4288900000000000
2013-01-01	2.1290900000000000
2014-01-01	1.7464600000000000
2015-01-01	1.5336000000000000
2016-01-01	1.3967700000000000