Year	Percent
1980-01-01	0.28742700000000000
1981-01-01	0.26765000000000000
1982-01-01	0.37404299999999996
1983-01-01	0.52775000000000000
1984-01-01	0.41456700000000000
1985-01-01	1.41610000000000000
1986-01-01	1.38306000000000000
1987-01-01	1.28231000000000000
1988-01-01	1.07815000000000000
1989-01-01	0.87656499999999990
1990-01-01	0.89577700000000000
1991-01-01	0.63947900000000000
1992-01-01	0.59152700000000000
1993-01-01	2.90837999999999970
1994-01-01	4.06424000000000000
1995-01-01	4.24813000000000100
1996-01-01	6.37226000000000000
1997-01-01	8.36793999999999900
1998-01-01	11.42760000000000000
1999-01-01	9.40255000000000000
2000-01-01	8.63315000000000000
2001-01-01	6.78961999999999900
2002-01-01	5.55468000000000000
2003-01-01	4.24220000000000000
2004-01-01	3.38334000000000000
2005-01-01	3.84071000000000000
2006-01-01	3.71346999999999960
2007-01-01	3.03213000000000000
2008-01-01	2.86068000000000000
2009-01-01	2.54208000000000000
2010-01-01	2.49524000000000030
2011-01-01	2.62768000000000000
2012-01-01	4.00233000000000100
2013-01-01	4.32479000000000000
2014-01-01	5.15793000000000000
2015-01-01	4.84794000000000000
2016-01-01	4.86963000000000000