Year	Percent
1975-01-01	0.16346200000000000
1976-01-01	0.18869300000000000
1977-01-01	0.17539300000000000
1978-01-01	0.13738100000000000
1979-01-01	0.12450399999999999
1980-01-01	0.12251800000000000
1981-01-01	0.12100799999999999
1982-01-01	0.10771500000000000
1983-01-01	0.13947500000000000
1984-01-01	0.17339900000000000
1985-01-01	0.65399800000000000
1986-01-01	1.15627000000000010
1987-01-01	1.14362000000000000
1988-01-01	1.28306000000000000
1989-01-01	10.49410000000000000
1990-01-01	26.57260000000000000
1991-01-01	18.75310000000000000
1992-01-01	3.37457000000000000
1993-01-01	2.93160000000000000
1994-01-01	3.83196999999999970
1995-01-01	4.79876000000000000
1996-01-01	4.82870000000000000
1997-01-01	4.94877000000000000
1998-01-01	6.86433000000000100
1999-01-01	6.68821000000000100
2000-01-01	5.05317000000000000
2001-01-01	4.25206000000000000
2002-01-01	3.33821999999999970
2003-01-01	3.78855000000000000
2004-01-01	6.48297000000000000
2005-01-01	10.96940000000000000
2006-01-01	18.84600000000000000
2007-01-01	28.12220000000000000
2008-01-01	27.64430000000000000
2009-01-01	18.07180000000000000
2010-01-01	12.50110000000000000
2011-01-01	10.52620000000000000
2012-01-01	7.29206000000000000
2013-01-01	5.90834000000000000
2014-01-01	6.24367000000000000
2015-01-01	7.27628999999999950
2016-01-01	7.41463999999999950
2017-01-01	8.01464000000000000