Year	Percent
1975-01-01	1.39763000000000000
1976-01-01	0.89585700000000000
1977-01-01	1.12100000000000000
1978-01-01	0.91446100000000010
1979-01-01	1.44171000000000000
1980-01-01	1.35358000000000000
1981-01-01	1.74067000000000020
1982-01-01	2.39051000000000000
1983-01-01	1.75304000000000020
1984-01-01	1.60604000000000000
1985-01-01	3.22935000000000000
1986-01-01	6.40147000000000000
1987-01-01	5.47473000000000000
1988-01-01	1.27637999999999980
1989-01-01	0.53787100000000000
1990-01-01	0.47116099999999994
1991-01-01	0.77713100000000000
1992-01-01	1.60540000000000000
1993-01-01	2.33520000000000000
1994-01-01	6.04496999999999900
1995-01-01	8.85927000000000000
1996-01-01	11.11290000000000000
1997-01-01	18.47010000000000000
1998-01-01	21.88180000000000000
1999-01-01	22.41510000000000000
2000-01-01	19.35280000000000000
2001-01-01	12.34720000000000000
2002-01-01	8.92896000000000000
2003-01-01	9.73738000000000000
2004-01-01	13.96530000000000000
2005-01-01	17.27570000000000000
2006-01-01	21.24170000000000000
2007-01-01	34.05150000000000000
2008-01-01	37.32990000000000000
2009-01-01	36.93030000000000000
2010-01-01	38.82890000000000000
2011-01-01	34.35140000000000000
2012-01-01	31.12930000000000000
2013-01-01	30.29430000000000000
2014-01-01	27.06620000000000000
2015-01-01	24.59610000000000000
2016-01-01	26.98890000000000000
2017-01-01	30.56000000000000000