Year	Percent
1996-01-01	3.55606
1997-01-01	3.37143
1998-01-01	3.20620
1999-01-01	3.02535
2000-01-01	3.02007
2001-01-01	2.87816
2002-01-01	2.80553
2003-01-01	3.03211
2004-01-01	2.93316
2005-01-01	2.90205
2006-01-01	2.48658
2007-01-01	2.53133
2008-01-01	2.53087
2009-01-01	2.56399
2010-01-01	3.06914
2011-01-01	2.49079
2012-01-01	2.59419
2013-01-01	2.31858
2014-01-01	2.32383
2015-01-01	2.16763
2016-01-01	2.38866