Year	Percent
1980-01-01	1.44895000000000000
1981-01-01	1.74189000000000020
1982-01-01	1.36416000000000000
1983-01-01	0.59820400000000000
1984-01-01	0.55693200000000000
1985-01-01	0.51695500000000000
1986-01-01	0.48566099999999995
1987-01-01	0.38837900000000000
1988-01-01	0.43767500000000000
1989-01-01	1.96352000000000020
1990-01-01	1.32683000000000000
1991-01-01	0.52674200000000000
1992-01-01	0.33923900000000000
1993-01-01	3.41241999999999960
1994-01-01	2.74452000000000000
1995-01-01	1.29125000000000000
1996-01-01	1.27135000000000000
1997-01-01	1.97512999999999980
1998-01-01	2.14547000000000000
1999-01-01	2.05682999999999970
2000-01-01	2.31110999999999980
2001-01-01	3.96204000000000000
2002-01-01	5.08151000000000000
2003-01-01	5.30711999999999900
2004-01-01	3.32414000000000030
2005-01-01	1.91045000000000000
2006-01-01	2.29874000000000000
2007-01-01	2.53927999999999980
2008-01-01	2.39298000000000000
2009-01-01	3.21913000000000000
2010-01-01	2.87373000000000000
2011-01-01	3.47172000000000000
2012-01-01	4.29171000000000000
2013-01-01	3.78423000000000040
2014-01-01	3.08563000000000000
2015-01-01	2.97322000000000000
2016-01-01	3.61070000000000000