Year	Percent
1980-01-01	0.5741670000000000
1981-01-01	0.7518760000000000
1982-01-01	1.2374300000000000
1983-01-01	1.9938799999999999
1984-01-01	2.1737900000000003
1985-01-01	2.1555000000000000
1986-01-01	2.5491200000000003
1987-01-01	3.2355700000000000
1988-01-01	4.5282700000000000
1989-01-01	4.1426800000000000
1990-01-01	3.7249100000000000
1991-01-01	2.6150200000000000
1992-01-01	2.5191300000000000
1993-01-01	1.8192599999999999
1994-01-01	2.9507800000000000
1995-01-01	1.4394200000000001
1996-01-01	1.2196700000000000
1997-01-01	1.0009299999999999
1998-01-01	1.1935500000000000
1999-01-01	1.3729100000000000
2000-01-01	1.1750000000000000
2001-01-01	1.1259800000000000
2002-01-01	2.2509900000000003
2003-01-01	1.9953100000000000
2004-01-01	2.1522700000000000
2005-01-01	1.8848000000000000
2006-01-01	1.6532200000000001
2007-01-01	2.2755799999999997
2008-01-01	1.3053000000000000
2009-01-01	1.2121200000000000
2010-01-01	2.6405900000000000
2011-01-01	2.1281500000000000
2012-01-01	1.5658700000000000
2013-01-01	3.1731800000000000
2014-01-01	3.5804600000000000
2015-01-01	5.0615000000000000
2016-01-01	4.4080300000000000