Year	Percent
1996-01-01	2.8169999999999997
1997-01-01	2.2545200000000000
1998-01-01	2.1394800000000000
1999-01-01	2.0421300000000000
2000-01-01	2.0365000000000000
2001-01-01	1.9199000000000000
2002-01-01	1.4478300000000000
2003-01-01	1.9472900000000002
2004-01-01	3.2112300000000000
2005-01-01	3.9586300000000003
2006-01-01	2.2837600000000000
2007-01-01	1.8396800000000000
2008-01-01	1.5622700000000000
2009-01-01	1.4572100000000001
2010-01-01	1.4998600000000000
2011-01-01	1.7246400000000002
2012-01-01	1.7811800000000000
2013-01-01	1.7970900000000000
2014-01-01	1.6599599999999999
2015-01-01	1.5341100000000000
2016-01-01	1.8412200000000000