Year	Percent
1973-01-01	0.008142000000000000
1974-01-01	0.036257000000000000
1975-01-01	0.087886000000000000
1976-01-01	0.063792000000000000
1977-01-01	0.062283000000000005
1978-01-01	0.080425000000000000
1979-01-01	0.026106000000000000
1980-01-01	0.096209000000000000
1981-01-01	0.075771000000000000
1982-01-01	0.132667000000000000
1983-01-01	0.224288000000000020
1984-01-01	0.192634000000000000
1985-01-01	0.290209000000000000
1986-01-01	0.369584000000000000
1987-01-01	0.163267000000000000
1988-01-01	0.252537000000000000
1989-01-01	0.638564000000000000
1990-01-01	0.357614000000000000
1991-01-01	0.257452000000000000
1992-01-01	0.080789000000000000
1993-01-01	-0.053598000000000000
1994-01-01	-0.091542000000000000
1995-01-01	0.047898000000000000
1996-01-01	0.070629000000000000
1997-01-01	-0.218088000000000000
1998-01-01	-0.040619999999999996
1999-01-01	-0.166372000000000000
2000-01-01	-0.121145000000000000
2001-01-01	-0.027139999999999997
2002-01-01	-0.251390000000000000
2003-01-01	0.166476999999999990
2004-01-01	-0.034121000000000000
2005-01-01	-0.055241999999999990
2006-01-01	0.212631000000000000
2007-01-01	0.229510000000000000
2008-01-01	-0.074436000000000000
2009-01-01	-0.070517000000000000
2010-01-01	-0.042806000000000000
2011-01-01	-0.088754000000000000
2012-01-01	0.015734000000000000
2013-01-01	0.246057000000000030
2014-01-01	0.166481000000000000
2015-01-01	0.323847000000000000
2016-01-01	0.163357000000000000