Year	Percent
1980-01-01	4.0828700000000000
1981-01-01	4.1126300000000000
1982-01-01	3.4270099999999997
1983-01-01	3.8063500000000000
1984-01-01	3.4507000000000000
1985-01-01	2.5541500000000000
1986-01-01	3.8502300000000003
1987-01-01	3.8649199999999997
1988-01-01	3.4401500000000000
1989-01-01	3.5220300000000004
1990-01-01	4.2937000000000000
1991-01-01	6.9051000000000000
1992-01-01	9.4873500000000000
1993-01-01	10.9871000000000000
1994-01-01	9.9504900000000000
1995-01-01	11.3701000000000000
1996-01-01	13.9276000000000000
1997-01-01	13.2239000000000000
1998-01-01	9.3515000000000000
1999-01-01	7.1618800000000000
2000-01-01	8.1293400000000000
2001-01-01	7.5123000000000000
2002-01-01	6.5525600000000000
2003-01-01	6.6778300000000000
2004-01-01	8.1208600000000000
2005-01-01	9.2344000000000000
2006-01-01	9.0952600000000010
2007-01-01	8.4269900000000000
2008-01-01	10.1114000000000000
2009-01-01	9.1998100000000010
2010-01-01	7.4174399999999990
2011-01-01	8.1455100000000000
2012-01-01	8.8592600000000000
2013-01-01	12.5074000000000000
2014-01-01	13.2897000000000000
2015-01-01	16.2577000000000000
2016-01-01	16.5781000000000000