Year	Percent
1993-01-01	12.150
1994-01-01	12.825
1995-01-01	12.625
1996-01-01	12.675
1997-01-01	12.550
1998-01-01	12.100
1999-01-01	11.175
2000-01-01	10.175
2001-01-01	9.475
2002-01-01	9.650
2003-01-01	10.050
2004-01-01	10.225
2005-01-01	10.050
2006-01-01	9.350
2007-01-01	8.400
2008-01-01	8.225
2009-01-01	9.650
2010-01-01	10.250
2011-01-01	10.375
2012-01-01	11.500
2013-01-01	12.100
2014-01-01	11.800
2015-01-01	11.050
2016-01-01	10.375
2017-01-01	9.450