Year	Percent
1975-01-01	0.29751300000000000
1976-01-01	0.32239500000000000
1977-01-01	0.33432600000000000
1978-01-01	0.41327200000000003
1979-01-01	0.41327200000000003
1980-01-01	0.41327200000000003
1981-01-01	0.41327200000000003
1982-01-01	0.41327200000000003
1983-01-01	0.41327200000000003
1984-01-01	0.41327200000000003
1985-01-01	0.41327200000000003
1986-01-01	0.41327200000000003
1987-01-01	0.41327200000000003
1988-01-01	0.41327200000000003
1989-01-01	0.41327200000000003
1990-01-01	0.41327200000000003
1991-01-01	0.41327200000000003
1992-01-01	0.41327200000000003
1993-01-01	0.30122899999999997
1994-01-01	0.41732700000000006
1995-01-01	0.53483500000000010
1996-01-01	0.96120100000000000
1997-01-01	1.12586000000000000
1998-01-01	0.78953600000000000
1999-01-01	1.05845000000000000
2000-01-01	2.56683000000000000
2001-01-01	2.42172999999999970
2002-01-01	1.12253000000000000
2003-01-01	1.80515999999999990
2004-01-01	3.85245000000000000
2005-01-01	4.07973000000000050
2006-01-01	2.24635000000000000
2007-01-01	1.79371000000000000
2008-01-01	2.75305000000000000
2009-01-01	3.72855000000000000
2010-01-01	3.40630000000000000
2011-01-01	2.69465000000000000
2012-01-01	2.33471000000000000
2013-01-01	5.47351000000000000
2014-01-01	6.90084000000000000
2015-01-01	3.90622000000000000
2016-01-01	3.12109000000000000
2017-01-01	3.36746999999999950