Year	Percent
1990-01-01	2.1834000000000000
1991-01-01	2.1599600000000000
1992-01-01	2.6464800000000000
1993-01-01	2.8996400000000000
1994-01-01	2.6339000000000000
1995-01-01	2.3065200000000000
1996-01-01	2.4852000000000000
1997-01-01	2.4942000000000000
1998-01-01	2.4479400000000000
1999-01-01	2.3698400000000000
2000-01-01	2.2953400000000000
2001-01-01	2.4880700000000000
2002-01-01	2.4505900000000000
2003-01-01	2.4231900000000000
2004-01-01	2.5359000000000000
2005-01-01	2.8880800000000000
2006-01-01	4.1322900000000000
2007-01-01	3.6811800000000003
2008-01-01	1.7135099999999999
2009-01-01	1.7919200000000002
2010-01-01	1.7475900000000002
2011-01-01	1.6820099999999998
2012-01-01	1.7141000000000000
2013-01-01	1.8468400000000000
2014-01-01	1.6108500000000000
2015-01-01	1.5030700000000001