Year	Percent
1990-01-01	2.2338299999999998
1991-01-01	2.2976099999999997
1992-01-01	2.3604200000000000
1993-01-01	2.3974500000000000
1994-01-01	2.3959700000000000
1995-01-01	2.4355300000000000
1996-01-01	2.3044599999999997
1997-01-01	2.2234400000000000
1998-01-01	2.1627700000000000
1999-01-01	2.1446600000000000
2000-01-01	2.1008500000000000
2001-01-01	2.1412299999999997
2002-01-01	2.2368200000000003
2003-01-01	2.3765200000000000
2004-01-01	2.3782200000000002
2005-01-01	2.3383200000000000
2006-01-01	2.2619700000000003
2007-01-01	2.1234599999999997
2008-01-01	2.0661000000000000
2009-01-01	2.1571700000000003
2010-01-01	2.1587400000000003
2011-01-01	2.1145099999999997
2012-01-01	2.1531599999999997
2013-01-01	2.1406200000000000
2014-01-01	2.1081600000000000
2015-01-01	1.9731599999999998
2016-01-01	2.0690700000000000