Year	Percent
1960-01-01	8.3001300000000010000
1961-01-01	7.5306399999999990000
1962-01-01	6.2753600000000000000
1963-01-01	5.3973000000000000000
1964-01-01	4.8071699999999990000
1965-01-01	4.4563100000000000000
1966-01-01	4.7613800000000000000
1967-01-01	4.8975599999999995000
1968-01-01	5.1223100000000000000
1969-01-01	5.4743500000000000000
1970-01-01	5.5877000000000000000
1971-01-01	5.8128800000000010000
1972-01-01	5.4587900000000005000
1973-01-01	4.3716900000000000000
1974-01-01	4.9321500000000000000
1975-01-01	5.5026000000000000000
1976-01-01	5.0856000000000000000
1977-01-01	4.6178600000000000000
1978-01-01	4.4697500000000000000
1979-01-01	5.9491000000000000000
1980-01-01	6.3008000000000000000
1981-01-01	6.4621500000000000000
1982-01-01	7.2027000000000000000
1983-01-01	6.0752200000000000000
1984-01-01	6.2927000000000000000
1985-01-01	7.5645000000000000000
1986-01-01	7.9816199999999995000
1987-01-01	8.6849800000000000000
1988-01-01	8.1829300000000000000
1989-01-01	7.1275699999999995000
1990-01-01	5.2063200000000000000
1991-01-01	6.0945400000000000000
1992-01-01	9.0810600000000000000
1993-01-01	7.6434700000000000000
1994-01-01	5.3754800000000005000
1995-01-01	4.2401599999999995000
1996-01-01	3.3730900000000004000
1997-01-01	2.7819900000000000000
1998-01-01	2.0161800000000000000
1999-01-01	1.3544600000000000000
2000-01-01	1.0058400000000000000
2001-01-01	0.4222340000000000000
2002-01-01	0.0119300000000000000
2003-01-01	0.0061410000000000000
2004-01-01	0.0010360000000000000
2005-01-01	0.0011980000000000000
2006-01-01	0.0022600000000000003
2007-01-01	0.0010770000000000000
2008-01-01	0.0010770000000000000
2009-01-01	0.0010770000000000000
2010-01-01	0.0010770000000000000
2011-01-01	0.0010770000000000000
2012-01-01	0.0434590000000000000
2013-01-01	0.1751110000000000000
2014-01-01	0.2737110000000000400
2015-01-01	2.1111200000000000000
2016-01-01	5.2969900000000000000