Year	Percent
1973-01-01	0.25606999999999996
1974-01-01	0.22779600000000000
1975-01-01	0.32366100000000003
1976-01-01	0.84364599999999990
1977-01-01	0.80959900000000000
1978-01-01	0.53177600000000000
1979-01-01	0.79224200000000000
1980-01-01	1.25243000000000000
1981-01-01	1.67052000000000000
1982-01-01	2.19122000000000000
1983-01-01	1.59560000000000000
1984-01-01	0.66088500000000010
1985-01-01	1.16306000000000000
1986-01-01	1.71584000000000030
1987-01-01	1.88965000000000000
1988-01-01	1.98983000000000000
1989-01-01	3.07634000000000000
1990-01-01	4.39406000000000000
1991-01-01	4.45318000000000100
1992-01-01	4.24846000000000000
1993-01-01	4.86463000000000000
1994-01-01	7.02388000000000000
1995-01-01	7.62191999999999900
1996-01-01	5.80702000000000000
1997-01-01	6.87328000000000000
1998-01-01	9.49526000000000000
1999-01-01	7.61945000000000000
2000-01-01	2.76490000000000000
2001-01-01	1.13648000000000000
2002-01-01	2.39862000000000000
2003-01-01	2.70600000000000040
2004-01-01	1.16391000000000000
2005-01-01	0.57750200000000010
2006-01-01	0.69282400000000000
2007-01-01	0.76999300000000000
2008-01-01	0.75459700000000010
2009-01-01	0.92703099999999990
2010-01-01	0.96652100000000000
2011-01-01	0.96394300000000000
2012-01-01	1.09124000000000000
2013-01-01	1.46860000000000000
2014-01-01	2.86061000000000000
2015-01-01	3.54130000000000000
2016-01-01	4.20344000000000050