Year	Percent
1990-01-01	3.5289699999999997
1991-01-01	4.4529600000000000
1992-01-01	4.9434900000000000
1993-01-01	5.7614300000000010
1994-01-01	5.7381400000000005
1995-01-01	5.3126300000000000
1996-01-01	4.7011100000000000
1997-01-01	4.2287500000000000
1998-01-01	4.0642900000000000
1999-01-01	3.6031100000000000
2000-01-01	3.8028500000000000
2001-01-01	4.1650199999999990
2002-01-01	4.5666900000000000
2003-01-01	4.3837100000000000
2004-01-01	4.3280100000000000
2005-01-01	4.4026700000000000
2006-01-01	4.6218800000000000
2007-01-01	4.5774099999999995
2008-01-01	4.4009199999999990
2009-01-01	2.7206500000000000
2010-01-01	4.6052100000000000
2011-01-01	4.8180100000000000
2012-01-01	4.7818700000000000
2013-01-01	4.6653100000000000
2014-01-01	5.3338700000000000
2015-01-01	4.9382600000000000