Year	Percent
1980-01-01	1.2324100000000000
1981-01-01	1.0307400000000000
1982-01-01	0.7707170000000000
1983-01-01	1.1573000000000000
1984-01-01	1.5825700000000000
1985-01-01	1.5642200000000002
1986-01-01	2.4399400000000000
1987-01-01	4.4163600000000000
1988-01-01	4.9372500000000000
1989-01-01	4.8482900000000000
1990-01-01	4.2891100000000000
1991-01-01	4.1552600000000000
1992-01-01	3.8100199999999997
1993-01-01	4.1154699999999990
1994-01-01	2.3617600000000000
1995-01-01	2.0397600000000000
1996-01-01	1.7917500000000000
1997-01-01	2.0054500000000000
1998-01-01	3.7054099999999996
1999-01-01	2.8515900000000003
2000-01-01	4.0606599999999995
2001-01-01	3.1044800000000000
2002-01-01	3.3558400000000000
2003-01-01	2.1087300000000000
2004-01-01	2.1350700000000002
2005-01-01	2.0843000000000000
2006-01-01	1.7197500000000000
2007-01-01	1.0990600000000000
2008-01-01	0.9983020000000000
2009-01-01	0.8572649999999999
2010-01-01	1.3214800000000000
2011-01-01	2.3005900000000000
2012-01-01	1.6491099999999999
2013-01-01	2.2697700000000003
2014-01-01	2.5175300000000000
2015-01-01	2.3589800000000000
2016-01-01	2.7256299999999998