Year	Percent
1996-01-01	3.970
1997-01-01	3.975
1998-01-01	4.400
1999-01-01	5.080
2000-01-01	4.345
2001-01-01	4.110
2002-01-01	4.195
2003-01-01	4.345
2004-01-01	4.520
2005-01-01	4.390
2006-01-01	4.475
2007-01-01	4.670
2008-01-01	4.220
2009-01-01	4.390
2010-01-01	4.375
2011-01-01	4.345
2012-01-01	4.230
2013-01-01	3.900
2014-01-01	3.765
2015-01-01	3.560