Year	Percent
1996-01-01	1.7854299999999999
1997-01-01	1.9891900000000002
1998-01-01	2.2109600000000000
1999-01-01	2.1367200000000000
2000-01-01	1.4059300000000000
2001-01-01	1.8055100000000000
2002-01-01	2.1061200000000000
2003-01-01	2.3081900000000000
2004-01-01	2.6394800000000000
2005-01-01	3.9383700000000000
2006-01-01	3.3220900000000000
2007-01-01	3.0125800000000000
2008-01-01	2.7213800000000000
2009-01-01	2.3262000000000000
2010-01-01	2.6319800000000000
2011-01-01	2.7570099999999997
2012-01-01	2.4344099999999997
2013-01-01	2.1522500000000000
2014-01-01	2.0366500000000000
2015-01-01	1.8962000000000000
2016-01-01	1.6032000000000000