Year	Percent
1980-01-01	13.5119000000000000
1981-01-01	2.9758500000000000
1982-01-01	3.6603199999999996
1983-01-01	3.6902400000000000
1984-01-01	3.2734000000000000
1985-01-01	3.2144300000000000
1986-01-01	2.5930800000000000
1987-01-01	2.3136200000000002
1988-01-01	3.3041400000000003
1989-01-01	3.6282200000000000
1990-01-01	4.7178100000000000
1991-01-01	2.0108200000000003
1992-01-01	0.9563709999999999
1993-01-01	0.7358030000000000
1994-01-01	2.3065200000000000
1995-01-01	1.4863899999999999
1996-01-01	3.8206000000000000
1997-01-01	4.7045900000000005
1998-01-01	4.0006800000000000
1999-01-01	3.5571599999999997
2000-01-01	4.0226200000000000
2001-01-01	4.0820600000000000
2002-01-01	6.0327100000000000
2003-01-01	6.9236800000000000
2004-01-01	10.4831000000000000
2005-01-01	7.3107700000000000
2006-01-01	5.8521900000000000
2007-01-01	3.5498000000000000
2008-01-01	3.2607900000000000
2009-01-01	4.7564199999999990
2010-01-01	5.8302700000000000
2011-01-01	5.8169699999999995
2012-01-01	5.9277400000000000
2013-01-01	6.2472600000000000
2014-01-01	6.4957800000000000
2015-01-01	7.8079500000000000
2016-01-01	8.2628899999999990