Year	Percent
1998-01-01	3.5000000000000000
1999-01-01	2.7000000000000000
2000-01-01	3.5000000000000000
2001-01-01	2.4000000000000000
2002-01-01	3.2000000000000000
2003-01-01	1.7000000000000000
2004-01-01	2.0000000000000000
2005-01-01	1.4000000000000000
2006-01-01	1.4000000000000000
2007-01-01	1.2000000000000000
2008-01-01	1.5000000000000000
2009-01-01	2.1000000000000000
2010-01-01	1.8552099999999998
2011-01-01	1.8168799999999998
2012-01-01	1.7451599999999998
2013-01-01	1.7486099999999998
2014-01-01	1.5529500000000000
2015-01-01	1.6641800000000000
2016-01-01	1.5532400000000000