Year	Percent
1996-01-01	4.0165400000000000
1997-01-01	4.1071700000000000
1998-01-01	5.0205400000000004
1999-01-01	3.6129300000000004
2000-01-01	3.9110900000000000
2001-01-01	3.6349000000000000
2002-01-01	3.3763400000000003
2003-01-01	3.1511900000000000
2004-01-01	2.7117500000000000
2005-01-01	2.4199800000000000
2006-01-01	2.8032200000000000
2007-01-01	2.4768500000000000
2008-01-01	2.3825500000000000
2009-01-01	2.2469500000000000
2010-01-01	2.0995300000000000
2011-01-01	2.1256000000000000
2012-01-01	2.1276500000000000
2013-01-01	2.1861099999999998
2014-01-01	1.9984300000000000
2015-01-01	2.7565700000000000
2016-01-01	2.2812799999999998