Year	Percent
1970-01-01	1.14875000000000000
1971-01-01	2.39245000000000000
1972-01-01	2.53460000000000000
1973-01-01	1.83657000000000000
1974-01-01	0.92948400000000000
1975-01-01	0.77524300000000000
1976-01-01	0.58253000000000000
1977-01-01	0.73662299999999990
1978-01-01	1.38892000000000020
1979-01-01	1.88245000000000000
1980-01-01	1.92372000000000000
1981-01-01	2.28647000000000000
1982-01-01	1.14225000000000000
1983-01-01	0.88402800000000000
1984-01-01	0.97144599999999990
1985-01-01	0.86810000000000000
1986-01-01	1.51066000000000010
1987-01-01	1.72955999999999980
1988-01-01	1.23481000000000000
1989-01-01	1.75718000000000000
1990-01-01	1.54676000000000010
1991-01-01	1.48182000000000010
1992-01-01	1.76399000000000020
1993-01-01	1.91625000000000000
1994-01-01	2.14585000000000000
1995-01-01	0.17729100000000000
1996-01-01	0.14332800000000000
1997-01-01	0.17450400000000000
1998-01-01	0.11596900000000000
1999-01-01	0.14864800000000000
2000-01-01	0.13782800000000000
2001-01-01	0.14964900000000000
2002-01-01	0.13760700000000000
2003-01-01	0.13494700000000000
2004-01-01	0.21979400000000002
2005-01-01	0.26456000000000000
2006-01-01	0.31740600000000000
2007-01-01	0.32444200000000000
2008-01-01	0.29118700000000000
2009-01-01	0.24443200000000000
2010-01-01	0.24463900000000000
2011-01-01	0.22726900000000000
2012-01-01	0.26619100000000000
2013-01-01	0.26148000000000005
2014-01-01	0.27851900000000000
2015-01-01	0.28522800000000004
2016-01-01	0.30319700000000000
2017-01-01	0.28239899999999996