Year	Percent
1980-01-01	2.7345700000000000
1981-01-01	2.4656599999999997
1982-01-01	2.4909400000000000
1983-01-01	2.0987200000000000
1984-01-01	4.0087300000000000
1985-01-01	4.2888500000000000
1986-01-01	3.6364699999999996
1987-01-01	3.3166200000000000
1988-01-01	1.9747900000000000
1989-01-01	1.5571300000000000
1990-01-01	1.5448100000000000
1991-01-01	1.4518900000000000
1992-01-01	1.5653299999999999
1993-01-01	3.0971400000000000
1994-01-01	2.3957400000000000
1995-01-01	2.8357300000000000
1996-01-01	3.5412800000000004
1997-01-01	2.1335400000000000
1998-01-01	1.6684500000000000
1999-01-01	2.1032300000000000
2000-01-01	2.0203900000000004
2001-01-01	1.5434400000000000
2002-01-01	2.7697700000000003
2003-01-01	3.5963300000000005
2004-01-01	2.9084700000000000
2005-01-01	2.9267200000000000
2006-01-01	2.4509700000000000
2007-01-01	3.8773400000000002
2008-01-01	4.5376300000000000
2009-01-01	3.9243200000000000
2010-01-01	3.2516700000000003
2011-01-01	5.1434400000000000
2012-01-01	3.7508900000000000
2013-01-01	4.1457900000000000
2014-01-01	3.6052000000000000
2015-01-01	4.1498099999999996
2016-01-01	3.5850600000000000