Year	Percent
1980-01-01	3.06948000000000000
1981-01-01	2.43375000000000000
1982-01-01	0.59900200000000000
1983-01-01	0.20204800000000000
1984-01-01	0.36132000000000000
1985-01-01	0.10581700000000001
1986-01-01	0.81700900000000000
1987-01-01	0.47564799999999996
1988-01-01	1.68504000000000000
1989-01-01	2.11450999999999970
1990-01-01	3.28695000000000000
1991-01-01	3.30895000000000000
1992-01-01	2.24317999999999970
1993-01-01	2.66215000000000000
1994-01-01	2.30333000000000000
1995-01-01	2.14236000000000000
1996-01-01	2.02614000000000030
1997-01-01	1.91437000000000010
1998-01-01	1.89149000000000010
1999-01-01	2.92328000000000000
2000-01-01	2.97075000000000000
2001-01-01	2.77956000000000000
2002-01-01	2.22385999999999970
2003-01-01	2.33230999999999970
2004-01-01	1.83575000000000000
2005-01-01	1.90895000000000000
2006-01-01	2.36738000000000000
2007-01-01	2.42002000000000000
2008-01-01	2.59454000000000030
2009-01-01	1.98013000000000000
2010-01-01	1.81785999999999980
2011-01-01	2.60543000000000000
2012-01-01	2.01924000000000000
2013-01-01	2.72529000000000000
2014-01-01	4.05171999999999950
2015-01-01	4.58983000000000000
2016-01-01	3.55475000000000000