Year	Percent
1991-01-01	2.6878000000000000
1992-01-01	2.8148200000000000
1993-01-01	2.8444900000000000
1994-01-01	3.0178100000000000
1995-01-01	2.6720900000000003
1996-01-01	2.3708099999999996
1997-01-01	2.2005800000000000
1998-01-01	2.3352700000000000
1999-01-01	2.3094300000000000
2000-01-01	2.3540799999999997
2001-01-01	2.3235200000000003
2002-01-01	2.6371599999999997
2003-01-01	2.7097200000000000
2004-01-01	2.6038400000000000
2005-01-01	2.4153700000000002
2006-01-01	1.8590000000000000
2007-01-01	1.7207900000000000
2008-01-01	1.7947500000000000
2009-01-01	1.9536700000000000
2010-01-01	1.8681200000000000
2011-01-01	1.7976700000000000
2012-01-01	1.7884300000000000
2013-01-01	1.8129900000000000
2014-01-01	1.8223099999999999
2015-01-01	1.8798800000000000
2016-01-01	1.9074200000000001