Year	Percent
1970-01-01	0.083614000000000000
1971-01-01	0.075627000000000000
1972-01-01	0.078997000000000000
1973-01-01	0.054202999999999994
1974-01-01	0.071749000000000010
1975-01-01	0.093467000000000000
1976-01-01	0.078548000000000000
1977-01-01	0.070726000000000000
1978-01-01	0.093501000000000000
1979-01-01	0.088682000000000010
1980-01-01	0.080855000000000000
1981-01-01	0.096908000000000010
1982-01-01	0.097285000000000000
1983-01-01	0.082876999999999990
1984-01-01	0.073733000000000000
1985-01-01	0.055929999999999994
1986-01-01	0.043252000000000000
1987-01-01	0.042112000000000004
1988-01-01	0.041996000000000000
1989-01-01	0.068691999999999990
1990-01-01	0.117344000000000000
1991-01-01	0.104170000000000000
1992-01-01	0.088652000000000000
1993-01-01	0.075721000000000010
1994-01-01	0.070672000000000000
1995-01-01	0.053189000000000000
1996-01-01	0.050733000000000000
1997-01-01	0.115343000000000000
1998-01-01	0.187702000000000000
1999-01-01	0.224590000000000000
2000-01-01	0.238090000000000000
2001-01-01	0.231588000000000020
2002-01-01	0.231678000000000020
2003-01-01	0.222987000000000000
2004-01-01	0.204474000000000000
2005-01-01	0.238123999999999970
2006-01-01	0.254563000000000000
2007-01-01	0.264971000000000000
2008-01-01	0.272969000000000000
2009-01-01	0.290041000000000000
2010-01-01	0.284992000000000000
2011-01-01	0.277880000000000000
2012-01-01	0.273642000000000000
2013-01-01	0.264607000000000040
2014-01-01	0.260300000000000000
2015-01-01	0.259725000000000000
2016-01-01	0.255419000000000000
2017-01-01	0.249904000000000000