Year	Percent
1977-01-01	3.78706999999999950
1978-01-01	3.72316000000000000
1979-01-01	3.66305999999999980
1980-01-01	1.41306000000000000
1981-01-01	1.18144000000000000
1982-01-01	1.30854000000000000
1983-01-01	1.31842000000000010
1984-01-01	1.19676000000000000
1985-01-01	1.51341000000000010
1986-01-01	1.47694000000000000
1987-01-01	1.52907000000000020
1988-01-01	1.72969000000000020
1989-01-01	1.72511000000000000
1990-01-01	1.70501000000000000
1991-01-01	1.52799000000000000
1992-01-01	1.27326000000000000
1993-01-01	1.23768000000000000
1994-01-01	1.19591000000000000
1995-01-01	1.16986000000000010
1996-01-01	0.87331000000000000
1997-01-01	0.60221300000000000
1998-01-01	0.50278700000000000
1999-01-01	0.39817800000000003
2000-01-01	0.13328900000000002
2001-01-01	0.58470600000000010
2002-01-01	0.65105400000000000
2003-01-01	0.77990500000000010
2004-01-01	0.72535300000000000
2005-01-01	0.79148000000000010
2006-01-01	1.65641000000000000
2007-01-01	1.66839000000000000
2008-01-01	1.50263000000000000
2009-01-01	1.24278000000000000
2010-01-01	1.39265000000000000
2011-01-01	1.06152000000000000
2012-01-01	1.01633000000000000
2013-01-01	1.01184000000000000
2014-01-01	1.51518000000000000
2015-01-01	1.02033000000000000
2016-01-01	0.86854400000000010
2017-01-01	0.86225100000000000