Year	Percent
1996-01-01	3.235
1997-01-01	3.610
1998-01-01	3.710
1999-01-01	4.070
2000-01-01	3.885
2001-01-01	3.520
2002-01-01	3.655
2003-01-01	3.730
2004-01-01	3.700
2005-01-01	3.555
2006-01-01	3.285
2007-01-01	3.300
2008-01-01	3.040
2009-01-01	3.060
2010-01-01	3.065
2011-01-01	2.995
2012-01-01	2.945
2013-01-01	2.790
2014-01-01	2.695
2015-01-01	2.430