Year	Percent
1996-01-01	12.485
1997-01-01	12.400
1998-01-01	12.780
1999-01-01	12.840
2000-01-01	12.770
2001-01-01	11.730
2002-01-01	12.465
2003-01-01	13.985
2004-01-01	15.655
2005-01-01	16.750
2006-01-01	18.200
2007-01-01	18.520
2008-01-01	15.010
2009-01-01	11.170
2010-01-01	12.575
2011-01-01	12.800
2012-01-01	12.975
2013-01-01	11.910
2014-01-01	12.210
2015-01-01	10.230