Year	Percent
1970-01-01	0.015441000000000000
1971-01-01	0.028562999999999998
1972-01-01	0.026104000000000002
1973-01-01	0.027367000000000002
1974-01-01	0.031149000000000000
1975-01-01	0.032050000000000000
1976-01-01	0.046973000000000000
1977-01-01	0.064964000000000000
1978-01-01	0.047284000000000000
1979-01-01	0.038297000000000005
1980-01-01	0.047104000000000000
1981-01-01	0.052907000000000000
1982-01-01	0.000121000000000000
1983-01-01	0.023698000000000000
1984-01-01	0.020881000000000000
1985-01-01	0.020747000000000000
1986-01-01	0.012425000000000000
1987-01-01	0.054416999999999990
1988-01-01	0.051125000000000000
1989-01-01	0.059227999999999996
1990-01-01	0.059075000000000000
1991-01-01	0.076544000000000000
1992-01-01	0.082832000000000000
1993-01-01	0.110202000000000000
1994-01-01	0.110279000000000000
1995-01-01	0.096655999999999990
1996-01-01	0.093689000000000000
1997-01-01	0.119406000000000000
1998-01-01	0.047062000000000000
1999-01-01	0.134390000000000000
2000-01-01	0.168514000000000000
2001-01-01	0.240992999999999990
2002-01-01	0.194038000000000020
2003-01-01	0.409959000000000000
2004-01-01	0.418076000000000000
2005-01-01	0.465632000000000000
2006-01-01	0.534504000000000000
2007-01-01	0.657103000000000000
2008-01-01	0.796841000000000000
2009-01-01	0.923517000000000000
2010-01-01	0.831523999999999900
2011-01-01	0.778656999999999900
2012-01-01	0.789418000000000100
2013-01-01	0.793528000000000000
2014-01-01	0.794351000000000000
2015-01-01	0.675516000000000000
2016-01-01	0.561392000000000000
2017-01-01	0.551346000000000000