Year	Percent
1980-01-01	0.00025499999999999996
1981-01-01	2.37685000000000000000
1982-01-01	5.64246000000000000000
1983-01-01	4.90344000000000000000
1984-01-01	2.21520000000000000000
1985-01-01	2.15793000000000000000
1986-01-01	3.86480000000000000000
1987-01-01	6.46700000000000050000
1988-01-01	13.87730000000000000000
1989-01-01	18.96270000000000000000
1990-01-01	16.57510000000000000000
1991-01-01	20.58320000000000000000
1992-01-01	15.49720000000000000000
1993-01-01	6.74909000000000000000
1994-01-01	7.55793999999999900000
1995-01-01	7.05726000000000000000
1996-01-01	7.35563000000000100000
1997-01-01	7.35563000000000100000
1998-01-01	2.81833000000000000000
1999-01-01	2.02774000000000000000
2000-01-01	1.96075999999999980000
2001-01-01	2.36065000000000000000
2002-01-01	2.85340000000000000000
2003-01-01	2.27464000000000000000
2004-01-01	2.20985000000000000000
2005-01-01	2.25670000000000000000
2006-01-01	2.22509000000000020000
2007-01-01	2.05488000000000000000
2008-01-01	2.60534000000000000000
2009-01-01	2.09885999999999970000
2010-01-01	0.81177000000000000000
2011-01-01	1.00315000000000000000
2012-01-01	1.71662999999999990000
2013-01-01	2.73324000000000030000
2014-01-01	3.23381000000000000000
2015-01-01	3.36889000000000000000
2016-01-01	3.54055000000000000000