Year	Percent
1991-01-01	2.5328800000000000
1992-01-01	3.6366400000000003
1993-01-01	3.1719000000000000
1994-01-01	2.5747100000000000
1995-01-01	2.3552200000000000
1996-01-01	2.3127000000000000
1997-01-01	2.1641800000000000
1998-01-01	2.1624700000000000
1999-01-01	2.0063299999999997
2000-01-01	2.0076900000000000
2001-01-01	2.0942800000000000
2002-01-01	2.1606200000000000
2003-01-01	2.2200100000000000
2004-01-01	2.3197500000000000
2005-01-01	2.3962600000000000
2006-01-01	2.3627400000000000
2007-01-01	2.3004100000000000
2008-01-01	2.3135400000000000
2009-01-01	2.5378300000000000
2010-01-01	2.5458300000000000
2011-01-01	2.5001200000000000
2012-01-01	2.4640600000000000
2013-01-01	2.3417600000000000
2014-01-01	2.2451200000000000
2015-01-01	2.1503400000000004
2016-01-01	2.1604900000000002