Year	Percent
1980-01-01	0.22048500000000000
1981-01-01	0.23524400000000000
1982-01-01	0.31336100000000000
1983-01-01	0.47090900000000000
1984-01-01	0.98196100000000010
1985-01-01	1.46858000000000000
1986-01-01	0.65243600000000000
1987-01-01	0.46965400000000000
1988-01-01	0.31284000000000000
1989-01-01	0.18707900000000000
1990-01-01	0.33133500000000000
1991-01-01	0.49532600000000004
1992-01-01	1.16448000000000000
1993-01-01	2.61372000000000030
1994-01-01	3.17856000000000000
1995-01-01	3.54150999999999970
1996-01-01	3.68416000000000000
1997-01-01	4.13305999999999950
1998-01-01	4.87692000000000000
1999-01-01	4.18433000000000000
2000-01-01	4.15865000000000000
2001-01-01	3.78760000000000000
2002-01-01	4.21185000000000000
2003-01-01	4.22719000000000000
2004-01-01	4.17293000000000000
2005-01-01	3.38783000000000000
2006-01-01	3.88126999999999980
2007-01-01	3.49036999999999950
2008-01-01	3.96916999999999960
2009-01-01	5.24589000000000000
2010-01-01	5.37257000000000000
2011-01-01	5.20366000000000000
2012-01-01	5.15814000000000000
2013-01-01	4.56500000000000000
2014-01-01	3.96610000000000000
2015-01-01	3.13754000000000000
2016-01-01	2.73110000000000000