Year	Percent
1978-01-01	0.39997699999999997
1979-01-01	0.25054499999999996
1980-01-01	0.21649100000000000
1981-01-01	0.24344800000000000
1982-01-01	0.27806100000000000
1983-01-01	0.16291800000000000
1984-01-01	0.56689100000000000
1985-01-01	0.58295100000000000
1986-01-01	0.50269000000000000
1987-01-01	0.22355600000000000
1988-01-01	0.24163400000000002
1989-01-01	0.32082800000000000
1990-01-01	0.27133000000000000
1991-01-01	0.45418200000000000
1992-01-01	0.45418200000000000
1993-01-01	0.45418200000000000
1994-01-01	0.45418200000000000
1995-01-01	29.75170000000000000
1996-01-01	18.00720000000000000
1997-01-01	22.35220000000000000
1998-01-01	30.40910000000000000
1999-01-01	24.35850000000000000
2000-01-01	20.24760000000000000
2001-01-01	23.33000000000000000
2002-01-01	1.96657000000000020
2003-01-01	1.98430000000000000
2004-01-01	2.43942999999999980
2005-01-01	2.77605999999999980
2006-01-01	3.11864000000000000
2007-01-01	3.18908000000000000
2008-01-01	2.24972000000000000
2009-01-01	3.12843000000000000
2010-01-01	3.29668000000000030
2011-01-01	2.31517000000000000
2012-01-01	2.09858000000000000
2013-01-01	1.92580000000000000
2014-01-01	3.37941000000000000
2015-01-01	5.00055000000000000
2016-01-01	9.63332000000000000