Year	Percent
1973-01-01	0.43622600000000000
1974-01-01	0.36378200000000000
1975-01-01	0.34354700000000000
1976-01-01	0.29332400000000000
1977-01-01	0.23111300000000000
1978-01-01	0.19343600000000000
1979-01-01	0.16105700000000000
1980-01-01	0.29939499999999997
1981-01-01	0.27481300000000003
1982-01-01	0.25662100000000000
1983-01-01	0.25819899999999996
1984-01-01	0.26141700000000000
1985-01-01	0.08597400000000000
1986-01-01	0.18602000000000000
1987-01-01	0.34365900000000000
1988-01-01	0.24991999999999998
1989-01-01	0.23267500000000000
1990-01-01	0.23340000000000000
1991-01-01	0.72260700000000000
1992-01-01	0.50325100000000000
1993-01-01	1.24367000000000000
1994-01-01	1.25454000000000000
1995-01-01	1.68852000000000000
1996-01-01	3.38821999999999960
1997-01-01	4.21810000000000000
1998-01-01	6.07758000000000000
1999-01-01	8.66612000000000000
2000-01-01	8.70087000000000000
2001-01-01	12.05960000000000000
2002-01-01	12.50540000000000000
2003-01-01	13.35280000000000000
2004-01-01	11.42350000000000000
2005-01-01	9.40871000000000100
2006-01-01	9.62788999999999900
2007-01-01	9.05521000000000000
2008-01-01	7.32020000000000000
2009-01-01	9.90156000000000000
2010-01-01	8.56601000000000000
2011-01-01	8.63795000000000000
2012-01-01	9.04129000000000000
2013-01-01	10.85030000000000000
2014-01-01	12.35180000000000000
2015-01-01	17.44140000000000000
2016-01-01	18.71150000000000000