Year	Percent
1991-01-01	1.4372000000000000
1992-01-01	1.4799500000000000
1993-01-01	1.6646299999999998
1994-01-01	1.7767900000000000
1995-01-01	1.7771599999999999
1996-01-01	2.0144599999999997
1997-01-01	2.1589300000000000
1998-01-01	2.2504700000000000
1999-01-01	6.3876900000000000
2000-01-01	3.7917600000000000
2001-01-01	2.3244200000000000
2002-01-01	2.3275500000000000
2003-01-01	2.2499599999999997
2004-01-01	2.0909700000000000
2005-01-01	2.0073900000000000
2006-01-01	2.0026300000000000
2007-01-01	2.0553900000000000
2008-01-01	1.8183300000000000
2009-01-01	1.9172799999999999
2010-01-01	1.9668900000000002
2011-01-01	1.9737700000000000
2012-01-01	1.8406900000000002
2013-01-01	1.7614599999999998
2014-01-01	1.7367099999999998
2015-01-01	1.7628599999999999
2016-01-01	1.8393300000000000