Year	Percent
1992-01-01	2.4349800000000000
1993-01-01	2.5174400000000000
1994-01-01	2.5100100000000000
1995-01-01	2.5098000000000000
1996-01-01	2.4806300000000000
1997-01-01	2.4401700000000000
1998-01-01	2.3329400000000002
1999-01-01	2.2238900000000004
2000-01-01	2.1645800000000000
2001-01-01	2.2116900000000000
2002-01-01	2.2926800000000000
2003-01-01	2.3945300000000000
2004-01-01	2.4338900000000003
2005-01-01	2.4360600000000000
2006-01-01	2.3776800000000000
2007-01-01	2.3153000000000000
2008-01-01	2.3082700000000003
2009-01-01	2.3798200000000000
2010-01-01	2.3438900000000000
2011-01-01	2.3201500000000000
2012-01-01	2.3371100000000000
2013-01-01	2.3515400000000000
2014-01-01	2.2715300000000000
2015-01-01	2.2347900000000003
2016-01-01	2.2032900000000000