Year	Percent
1990-01-01	3.4099800000000005
1991-01-01	3.0642800000000000
1992-01-01	2.6617700000000000
1993-01-01	2.5020900000000000
1994-01-01	2.2767300000000000
1995-01-01	2.1232500000000000
1996-01-01	2.2145799999999998
1997-01-01	2.2152500000000000
1998-01-01	2.0341600000000000
1999-01-01	2.3744200000000000
2000-01-01	2.6183200000000000
2001-01-01	2.7225400000000000
2002-01-01	2.3905300000000000
2003-01-01	2.4684100000000000
2004-01-01	2.4106200000000000
2005-01-01	2.1656000000000000
2006-01-01	1.8868400000000000
2007-01-01	2.0792800000000000
2008-01-01	2.3176700000000000
2009-01-01	2.1622900000000000
2010-01-01	2.3051900000000000
2011-01-01	2.2240400000000000
2012-01-01	2.5337800000000000
2013-01-01	2.5223000000000000
2014-01-01	2.4733600000000000
2015-01-01	2.8900799999999998
2016-01-01	3.1675900000000000