Year	Percent
1980-01-01	0.97079300000000000
1981-01-01	1.10955000000000000
1982-01-01	0.75752200000000000
1983-01-01	0.21900799999999998
1984-01-01	0.13495700000000000
1985-01-01	0.12093000000000000
1986-01-01	0.11904000000000000
1987-01-01	0.19784300000000002
1988-01-01	0.23894700000000000
1989-01-01	0.22550599999999998
1990-01-01	0.23289200000000002
1991-01-01	0.52004700000000000
1992-01-01	1.17815000000000000
1993-01-01	1.49022000000000000
1994-01-01	2.10910000000000000
1995-01-01	2.06775000000000000
1996-01-01	1.85575000000000000
1997-01-01	2.26746000000000000
1998-01-01	2.67890999999999970
1999-01-01	2.41723000000000000
2000-01-01	1.19822000000000000
2001-01-01	0.96791000000000000
2002-01-01	0.89748500000000010
2003-01-01	0.91355900000000000
2004-01-01	1.26697000000000020
2005-01-01	4.04899000000000000
2006-01-01	7.70703000000000050
2007-01-01	8.54281000000000100
2008-01-01	7.54728000000000100
2009-01-01	7.82539000000000000
2010-01-01	7.93396999999999950
2011-01-01	7.38026999999999900
2012-01-01	8.01019000000000000
2013-01-01	6.80401999999999950
2014-01-01	4.82946000000000000
2015-01-01	4.16763000000000000
2016-01-01	4.43854000000000000
2017-01-01	4.66336000000000000