Year	Percent
1975-01-01	7.9981800000000005
1976-01-01	12.2957000000000000
1977-01-01	5.6065600000000000
1978-01-01	10.1583000000000000
1979-01-01	10.1583000000000000
1980-01-01	10.1583000000000000
1981-01-01	10.1583000000000000
1982-01-01	10.1583000000000000
1983-01-01	10.1583000000000000
1984-01-01	10.1583000000000000
1985-01-01	10.1583000000000000
1986-01-01	10.1583000000000000
1987-01-01	10.1583000000000000
1988-01-01	10.1583000000000000
1989-01-01	10.1583000000000000
1990-01-01	10.1583000000000000
1991-01-01	10.1583000000000000
1992-01-01	10.1583000000000000
1993-01-01	18.1829000000000000
1994-01-01	22.7778000000000000
1995-01-01	9.5920200000000000
1996-01-01	14.7151000000000000
1997-01-01	6.5282900000000000
1998-01-01	6.1071200000000000
1999-01-01	10.6854000000000000
2000-01-01	21.0359000000000000
2001-01-01	8.9926700000000000
2002-01-01	20.5515000000000000
2003-01-01	20.3298000000000000
2004-01-01	32.8520000000000000
2005-01-01	18.2787000000000000
2006-01-01	13.0593000000000000
2007-01-01	20.5151000000000000
2008-01-01	31.3883000000000000
2009-01-01	32.2472000000000000
2010-01-01	24.0341000000000000
2011-01-01	15.0534000000000000
2012-01-01	15.8642000000000000
2013-01-01	23.2542000000000000
2014-01-01	11.4767000000000000
2015-01-01	8.6199200000000000
2016-01-01	19.4821000000000000
2017-01-01	11.2510000000000000