Year	Percent
1996-01-01	2.5998200000000002
1997-01-01	3.6516300000000004
1998-01-01	4.9488000000000000
1999-01-01	4.2865699999999990
2000-01-01	3.1598400000000000
2001-01-01	3.2637800000000000
2002-01-01	3.0752800000000000
2003-01-01	3.4545700000000000
2004-01-01	2.7045000000000000
2005-01-01	2.1859400000000000
2006-01-01	2.0144000000000000
2007-01-01	1.7447500000000000
2008-01-01	1.5977900000000000
2009-01-01	1.6593600000000000
2010-01-01	1.6830400000000000
2011-01-01	1.9606100000000000
2012-01-01	1.8163300000000000
2013-01-01	2.4323900000000003
2014-01-01	2.4065000000000000
2015-01-01	3.4891800000000000
2016-01-01	3.2075800000000000