Year	Percent
1980-01-01	0.5959040000000000
1981-01-01	0.6156610000000000
1982-01-01	0.6917260000000001
1983-01-01	0.6781760000000000
1984-01-01	0.6606750000000000
1985-01-01	1.7105900000000000
1986-01-01	2.3469800000000000
1987-01-01	3.2457300000000000
1988-01-01	3.5248100000000000
1989-01-01	2.6125400000000000
1990-01-01	2.6059900000000003
1991-01-01	2.8076300000000000
1992-01-01	7.6819399999999990
1993-01-01	7.1831500000000000
1994-01-01	6.8218000000000000
1995-01-01	6.7591899999999990
1996-01-01	6.6564800000000000
1997-01-01	6.0792100000000000
1998-01-01	5.5449600000000000
1999-01-01	5.0229500000000000
2000-01-01	4.2646400000000000
2001-01-01	4.0332200000000000
2002-01-01	3.6299500000000000
2003-01-01	3.6523800000000004
2004-01-01	3.5825900000000000
2005-01-01	5.1320900000000000
2006-01-01	4.4372000000000000
2007-01-01	4.3526600000000000
2008-01-01	3.3401500000000000
2009-01-01	3.7416199999999997
2010-01-01	5.0863100000000000
2011-01-01	5.8233000000000000
2012-01-01	5.8920900000000005
2013-01-01	6.4087600000000000
2014-01-01	7.6050000000000000
2015-01-01	7.9951000000000000
2016-01-01	9.3622700000000000