Year	Percent
1998-01-01	2.6000000000000000
1999-01-01	1.7000000000000000
2000-01-01	2.4000000000000000
2001-01-01	2.4000000000000000
2002-01-01	3.0000000000000000
2003-01-01	3.0000000000000000
2004-01-01	2.7000000000000000
2005-01-01	2.6000000000000000
2006-01-01	2.7000000000000000
2007-01-01	2.2000000000000000
2008-01-01	1.9000000000000000
2009-01-01	2.3000000000000000
2010-01-01	2.8307200000000000
2011-01-01	2.7068200000000000
2012-01-01	2.8133700000000000
2013-01-01	2.8665400000000000
2014-01-01	3.4733699999999996
2015-01-01	3.3928400000000000
2016-01-01	2.6952200000000000