Year	Percent
1977-01-01	0.483618999999999970
1978-01-01	0.639021000000000000
1979-01-01	0.689655000000000000
1980-01-01	0.754812000000000000
1981-01-01	0.686126000000000000
1982-01-01	0.437087000000000000
1983-01-01	0.679040000000000000
1984-01-01	0.682752000000000000
1985-01-01	0.515316000000000000
1986-01-01	0.190797000000000000
1987-01-01	0.214319000000000000
1988-01-01	0.241192000000000020
1989-01-01	0.368650000000000000
1990-01-01	0.128766000000000020
1991-01-01	0.914566000000000000
1992-01-01	1.136930000000000000
1993-01-01	0.816243000000000000
1994-01-01	0.033031000000000000
1995-01-01	0.038426000000000000
1996-01-01	0.038731000000000000
1997-01-01	0.043029000000000005
1998-01-01	0.142856999999999980
1999-01-01	0.259757000000000000
2000-01-01	0.140108999999999980
2001-01-01	0.026195999999999997
2002-01-01	1.400220000000000000
2003-01-01	1.848650000000000000
2004-01-01	0.613169000000000000
2005-01-01	0.217421000000000000
2006-01-01	0.079958000000000000
2007-01-01	0.095348000000000000
2008-01-01	0.062271000000000010
2009-01-01	0.118697000000000000
2010-01-01	0.098434000000000010
2011-01-01	0.088049000000000000
2012-01-01	0.161797000000000000
2013-01-01	0.135911999999999980
2014-01-01	0.168565000000000020
2015-01-01	0.138930000000000000
2016-01-01	0.045557000000000000
2017-01-01	0.019762000000000002