Year	Percent
1991-01-01	1.8332099999999998
1992-01-01	1.9050099999999999
1993-01-01	2.1190400000000000
1994-01-01	2.2060100000000000
1995-01-01	2.1846400000000004
1996-01-01	2.1752900000000000
1997-01-01	2.1268500000000000
1998-01-01	2.0321200000000000
1999-01-01	1.9456600000000000
2000-01-01	1.4288100000000001
2001-01-01	1.3945200000000000
2002-01-01	1.5789200000000000
2003-01-01	1.7215000000000000
2004-01-01	1.6944400000000002
2005-01-01	1.6583500000000000
2006-01-01	1.5923300000000000
2007-01-01	1.5934500000000000
2008-01-01	1.6619300000000000
2009-01-01	1.7043000000000000
2010-01-01	1.7114099999999999
2011-01-01	1.8714800000000000
2012-01-01	1.9812200000000000
2013-01-01	2.0601800000000000
2014-01-01	2.1064700000000003
2015-01-01	2.0516500000000000
2016-01-01	1.9629000000000000