Year	Percent
1975-01-01	0.69521899999999990
1976-01-01	0.49843699999999996
1977-01-01	0.53393100000000000
1978-01-01	0.62775200000000010
1979-01-01	0.49500800000000000
1980-01-01	0.49500800000000000
1981-01-01	0.49500800000000000
1982-01-01	0.91210400000000010
1983-01-01	0.88462299999999990
1984-01-01	0.70196100000000000
1985-01-01	0.92816700000000000
1986-01-01	1.17521000000000000
1987-01-01	1.55403000000000000
1988-01-01	1.12140000000000000
1989-01-01	1.12140000000000000
1990-01-01	1.12140000000000000
1991-01-01	1.12140000000000000
1992-01-01	1.12140000000000000
1993-01-01	1.12140000000000000
1994-01-01	1.12140000000000000
1995-01-01	12.78520000000000000
1996-01-01	9.41335000000000000
1997-01-01	13.74180000000000000
1998-01-01	16.37140000000000000
1999-01-01	15.14050000000000000
2000-01-01	10.91190000000000000
2001-01-01	13.24040000000000000
2002-01-01	10.99060000000000000
2003-01-01	8.90191000000000000
2004-01-01	7.50891000000000000
2005-01-01	5.94295000000000000
2006-01-01	5.38446000000000000
2007-01-01	8.03926000000000000
2008-01-01	6.44805000000000000
2009-01-01	8.28834000000000000
2010-01-01	6.96446999999999950
2011-01-01	5.49859000000000000
2012-01-01	5.82362000000000000
2013-01-01	17.67410000000000000
2014-01-01	17.10150000000000000
2015-01-01	25.30490000000000000
2016-01-01	25.39120000000000000