Year	Percent
1977-01-01	0.055957000000000010
1978-01-01	0.008619000000000000
1979-01-01	0.017516000000000000
1980-01-01	0.034184000000000000
1981-01-01	0.026506000000000002
1982-01-01	0.034668000000000000
1983-01-01	0.038939000000000000
1984-01-01	0.041195999999999997
1985-01-01	0.034875000000000000
1986-01-01	0.019254000000000000
1987-01-01	0.011368000000000001
1988-01-01	0.010418000000000000
1989-01-01	0.042026999999999995
1990-01-01	0.032541000000000000
1991-01-01	0.239276000000000020
1992-01-01	0.192651000000000000
1993-01-01	5.023460000000000000
1994-01-01	3.040260000000000000
1995-01-01	0.875901000000000000
1996-01-01	0.847684000000000000
1997-01-01	1.635120000000000100
1998-01-01	1.401510000000000000
1999-01-01	3.627059999999999700
2000-01-01	3.000530000000000000
2001-01-01	2.643110000000000000
2002-01-01	2.045030000000000000
2003-01-01	1.570920000000000000
2004-01-01	2.587200000000000000
2005-01-01	13.042600000000000000
2006-01-01	11.642800000000000000
2007-01-01	10.822600000000000000
2008-01-01	9.229490000000000000
2009-01-01	10.837800000000000000
2010-01-01	5.349960000000000000
2011-01-01	5.007210000000000000
2012-01-01	4.456620000000000000
2013-01-01	4.038540000000000000
2014-01-01	3.659830000000000400
2015-01-01	4.398090000000000000
2016-01-01	4.863280000000000500
2017-01-01	5.854820000000000000