Year	Percent
1976-01-01	0.046801999999999996
1977-01-01	0.042606000000000000
1978-01-01	0.039910000000000000
1979-01-01	0.029085000000000003
1980-01-01	0.037797000000000004
1981-01-01	0.035191000000000000
1982-01-01	0.037183000000000000
1983-01-01	0.038912000000000000
1984-01-01	0.038340000000000000
1985-01-01	0.142783000000000000
1986-01-01	0.285231000000000000
1987-01-01	0.851183000000000000
1988-01-01	2.165040000000000300
1989-01-01	2.678650000000000000
1990-01-01	2.523950000000000000
1991-01-01	2.954120000000000000
1992-01-01	4.221280000000000000
1993-01-01	5.849480000000001000
1994-01-01	9.216450000000000000
1995-01-01	7.424210000000000000
1996-01-01	6.706139999999999500
1997-01-01	7.224710000000001000
1998-01-01	5.289219999999999000
1999-01-01	7.106730000000001000
2000-01-01	8.252270000000000000
2001-01-01	10.853300000000000000
2002-01-01	9.984980000000000000
2003-01-01	8.504820000000000000
2004-01-01	7.518280000000000000
2005-01-01	7.169490000000000000
2006-01-01	8.000550000000000000
2007-01-01	7.497080000000000000
2008-01-01	6.507610000000000000
2009-01-01	7.995630000000000000
2010-01-01	7.409600000000000000
2011-01-01	7.359230000000000000
2012-01-01	8.503610000000000000
2013-01-01	9.567900000000000000
2014-01-01	11.470300000000000000
2015-01-01	12.367300000000000000
2016-01-01	13.287500000000000000