Year	Percent
1996-01-01	1.980
1997-01-01	1.810
1998-01-01	2.010
1999-01-01	1.680
2000-01-01	1.710
2001-01-01	1.905
2002-01-01	2.160
2003-01-01	1.740
2004-01-01	2.530
2005-01-01	2.400
2006-01-01	2.180
2007-01-01	2.080
2008-01-01	1.880
2009-01-01	1.650
2010-01-01	1.500
2011-01-01	1.570
2012-01-01	1.690
2013-01-01	1.710
2014-01-01	2.120
2015-01-01	1.795