Year	Percent
1990-01-01	2.4537600000000000
1991-01-01	2.0392400000000000
1992-01-01	1.9779000000000000
1993-01-01	2.6034900000000003
1994-01-01	2.4898900000000000
1995-01-01	2.2718100000000000
1996-01-01	2.2979100000000000
1997-01-01	2.6922700000000000
1998-01-01	2.5699600000000000
1999-01-01	2.4864200000000000
2000-01-01	2.4286500000000000
2001-01-01	2.4303900000000000
2002-01-01	2.2265400000000000
2003-01-01	2.1946800000000000
2004-01-01	2.1413700000000000
2005-01-01	2.1778800000000000
2006-01-01	2.3698900000000003
2007-01-01	2.3741500000000000
2008-01-01	2.4964100000000000
2009-01-01	2.4269000000000000
2010-01-01	2.4070700000000000
2011-01-01	2.4528900000000000
2012-01-01	2.4367900000000002
2013-01-01	2.6105200000000000
2014-01-01	2.7694200000000000
2015-01-01	2.9785100000000000