Year	Percent
1990-01-01	1.5093299999999998
1991-01-01	1.7176000000000000
1992-01-01	1.8069200000000000
1993-01-01	1.8523800000000000
1994-01-01	2.0457099999999997
1995-01-01	2.1569900000000000
1996-01-01	2.0192500000000000
1997-01-01	1.8870799999999999
1998-01-01	1.6682299999999999
1999-01-01	1.5189800000000000
2000-01-01	1.4860700000000000
2001-01-01	1.4314100000000000
2002-01-01	1.5537200000000000
2003-01-01	1.5569300000000000
2004-01-01	1.5475400000000000
2005-01-01	1.6098600000000000
2006-01-01	1.5742300000000000
2007-01-01	1.5999600000000000
2008-01-01	1.4435100000000000
2009-01-01	1.5201400000000000
2010-01-01	1.5049000000000000
2011-01-01	1.5315700000000000
2012-01-01	1.4136799999999998
2013-01-01	1.4564900000000000
2014-01-01	1.4290700000000000
2015-01-01	1.4194300000000000