Year	Percent
1975-01-01	3.6946199999999996
1976-01-01	3.5851300000000004
1977-01-01	4.4701200000000000
1978-01-01	5.6671100000000000
1979-01-01	5.6671100000000000
1980-01-01	5.6671100000000000
1981-01-01	5.6671100000000000
1982-01-01	5.6671100000000000
1983-01-01	5.6671100000000000
1984-01-01	5.6671100000000000
1985-01-01	5.6671100000000000
1986-01-01	5.6671100000000000
1987-01-01	5.6671100000000000
1988-01-01	5.6671100000000000
1989-01-01	5.6671100000000000
1990-01-01	5.6671100000000000
1991-01-01	5.6671100000000000
1992-01-01	5.6671100000000000
1993-01-01	1.8287500000000000
1994-01-01	2.6430100000000000
1995-01-01	5.9961800000000010
1996-01-01	10.5269000000000000
1997-01-01	12.9379000000000000
1998-01-01	12.9420000000000000
1999-01-01	14.5910000000000000
2000-01-01	19.3486000000000000
2001-01-01	13.7364000000000000
2002-01-01	6.5863900000000000
2003-01-01	12.5355000000000000
2004-01-01	18.0316000000000000
2005-01-01	17.3893000000000000
2006-01-01	13.5550000000000000
2007-01-01	11.3501000000000000
2008-01-01	11.4689000000000000
2009-01-01	12.7233000000000000
2010-01-01	14.5111000000000000
2011-01-01	16.4047000000000000
2012-01-01	15.8535000000000000
2013-01-01	40.7622000000000000
2014-01-01	46.8600000000000000
2015-01-01	25.3887000000000000
2016-01-01	22.8963000000000000
2017-01-01	23.7447000000000000