Year	Percent
1972-01-01	0.36972500000000000
1973-01-01	0.51634499999999990
1974-01-01	0.81001000000000000
1975-01-01	0.89986200000000000
1976-01-01	1.62452000000000000
1977-01-01	2.45090000000000000
1978-01-01	4.81709000000000000
1979-01-01	4.48510000000000000
1980-01-01	3.45493000000000050
1981-01-01	3.09367000000000000
1982-01-01	2.79160000000000000
1983-01-01	2.15362999999999970
1984-01-01	1.85667000000000000
1985-01-01	2.23170000000000000
1986-01-01	2.13984000000000000
1987-01-01	1.99873000000000000
1988-01-01	2.66547000000000000
1989-01-01	2.87068000000000000
1990-01-01	2.39502999999999980
1991-01-01	3.14118000000000000
1992-01-01	2.52899000000000030
1993-01-01	1.14122000000000010
1994-01-01	0.81800400000000000
1995-01-01	28.35450000000000000
1996-01-01	22.10410000000000000
1997-01-01	17.07220000000000000
1998-01-01	14.75690000000000000
1999-01-01	11.12650000000000000
2000-01-01	8.20586999999999900
2001-01-01	7.03630000000000000
2002-01-01	6.90448000000000000
2003-01-01	6.65891999999999900
2004-01-01	5.70407000000000000
2005-01-01	3.88571000000000000
2006-01-01	2.29862000000000000
2007-01-01	1.74695000000000000
2008-01-01	1.14152000000000000
2009-01-01	1.47509000000000000
2010-01-01	1.25118000000000000
2011-01-01	0.86702800000000000
2012-01-01	0.13154200000000002
2013-01-01	0.15494300000000000
2014-01-01	0.37276100000000000
2015-01-01	0.46661800000000003
2016-01-01	0.36152399999999996