Year	Percent
1990-01-01	2.8253600000000000
1991-01-01	2.9381200000000000
1992-01-01	3.2656900000000000
1993-01-01	3.4620400000000000
1994-01-01	3.4025900000000000
1995-01-01	3.0846500000000000
1996-01-01	2.7894700000000000
1997-01-01	2.7012700000000000
1998-01-01	2.5648600000000000
1999-01-01	2.4629100000000000
2000-01-01	2.5817099999999997
2001-01-01	2.8337600000000000
2002-01-01	3.0202000000000000
2003-01-01	3.1685300000000000
2004-01-01	2.9712600000000000
2005-01-01	2.9637100000000000
2006-01-01	2.6855500000000000
2007-01-01	2.5802099999999997
2008-01-01	2.5646900000000000
2009-01-01	2.5601700000000003
2010-01-01	2.5770600000000000
2011-01-01	2.4795100000000000
2012-01-01	2.4768100000000000
2013-01-01	2.3647200000000000
2014-01-01	2.2028700000000000
2015-01-01	2.3125299999999998