Year	Percent
1990-01-01	4.8440400000000010
1991-01-01	4.7703500000000000
1992-01-01	3.9931400000000004
1993-01-01	4.6919600000000000
1994-01-01	4.6201900000000000
1995-01-01	3.8791000000000000
1996-01-01	4.3232200000000000
1997-01-01	4.7106800000000000
1998-01-01	5.6047199999999995
1999-01-01	6.2123200000000000
2000-01-01	7.0400399999999990
2001-01-01	5.8486199999999995
2002-01-01	5.7853699999999995
2003-01-01	5.1846800000000000
2004-01-01	5.8830200000000000
2005-01-01	5.9524099999999995
2006-01-01	7.2841700000000000
2007-01-01	8.3735600000000010
2008-01-01	6.0344600000000000
2009-01-01	5.7828000000000000
2010-01-01	5.8274300000000006
2011-01-01	4.9131800000000005
2012-01-01	5.3679700000000000
2013-01-01	6.0059100000000000
2014-01-01	5.5478900000000000
2015-01-01	4.5055600000000000