Year	Percent
1990-01-01	2.2740000000000000
1991-01-01	2.2425000000000000
1992-01-01	2.2760100000000000
1993-01-01	2.3411299999999997
1994-01-01	2.3627100000000000
1995-01-01	2.3585300000000000
1996-01-01	2.3336500000000000
1997-01-01	2.2321900000000000
1998-01-01	2.2261900000000003
1999-01-01	1.7808300000000000
2000-01-01	1.7532000000000000
2001-01-01	1.7643400000000002
2002-01-01	1.8347900000000001
2003-01-01	1.9360400000000002
2004-01-01	1.9675900000000002
2005-01-01	1.9298000000000000
2006-01-01	1.8556000000000000
2007-01-01	2.2241600000000000
2008-01-01	2.2196200000000000
2009-01-01	2.2302600000000000
2010-01-01	2.2046500000000000
2011-01-01	2.0581099999999997
2012-01-01	2.0605400000000000
2013-01-01	2.0012700000000000
2014-01-01	1.7185599999999999
2015-01-01	1.6496900000000000
2016-01-01	1.3630200000000001