Year	Percent
1975-01-01	0.43642600000000004
1976-01-01	0.47377400000000000
1977-01-01	0.91510300000000010
1978-01-01	1.59552000000000000
1979-01-01	1.16104000000000000
1980-01-01	1.27234000000000000
1981-01-01	1.20892000000000000
1982-01-01	0.81697900000000000
1983-01-01	0.63389800000000000
1984-01-01	0.59008300000000000
1985-01-01	0.32364299999999996
1986-01-01	0.39828900000000000
1987-01-01	0.60079700000000000
1988-01-01	0.58540800000000000
1989-01-01	0.85870100000000000
1990-01-01	0.59348200000000000
1991-01-01	0.60707000000000000
1992-01-01	0.89277900000000010
1993-01-01	1.30491000000000000
1994-01-01	1.87905000000000000
1995-01-01	1.48861000000000000
1996-01-01	1.39860000000000000
1997-01-01	1.41693000000000000
1998-01-01	1.58013000000000000
1999-01-01	1.76347000000000000
2000-01-01	1.85090000000000000
2001-01-01	1.82706000000000000
2002-01-01	1.56044000000000000
2003-01-01	1.66209000000000000
2004-01-01	1.64304000000000000
2005-01-01	1.84667000000000000
2006-01-01	3.15607000000000000
2007-01-01	2.47037000000000000
2008-01-01	1.95972000000000010
2009-01-01	2.36850000000000000
2010-01-01	2.04630000000000000
2011-01-01	2.15409000000000000
2012-01-01	2.57813000000000000
2013-01-01	2.15177000000000000
2014-01-01	1.64061000000000000
2015-01-01	2.02928000000000000
2016-01-01	2.39519000000000000
2017-01-01	2.36784000000000000