Year	Percent
1990-01-01	2.3494300000000000
1991-01-01	2.4032299999999998
1992-01-01	2.4283300000000000
1993-01-01	2.4549200000000000
1994-01-01	2.4381400000000000
1995-01-01	2.5328800000000000
1996-01-01	2.4978100000000000
1997-01-01	2.4119099999999998
1998-01-01	2.3461900000000000
1999-01-01	2.2211400000000000
2000-01-01	2.1548500000000000
2001-01-01	2.3143000000000000
2002-01-01	2.5927300000000000
2003-01-01	2.8586300000000000
2004-01-01	2.8818000000000000
2005-01-01	2.7275300000000000
2006-01-01	2.6899700000000000
2007-01-01	2.3324100000000000
2008-01-01	2.2435200000000000
2009-01-01	2.4119599999999997
2010-01-01	2.3899600000000000
2011-01-01	2.4900300000000000
2012-01-01	2.5395700000000000
2013-01-01	2.6004400000000003
2014-01-01	2.5799400000000000
2015-01-01	2.6620400000000000
2016-01-01	2.6964900000000003