Year	Percent
1961-01-01	0.1485470000000000000
1962-01-01	0.1157789999999999900
1963-01-01	0.1136750000000000000
1964-01-01	0.1787690000000000000
1965-01-01	0.1382420000000000000
1966-01-01	0.1207910000000000100
1967-01-01	0.2248320000000000000
1968-01-01	1.0288100000000000000
1969-01-01	1.6338800000000000000
1970-01-01	1.3741600000000000000
1971-01-01	1.1206800000000000000
1972-01-01	1.0108200000000000000
1973-01-01	0.7711110000000000000
1974-01-01	0.5941450000000000000
1975-01-01	0.5139100000000001000
1976-01-01	0.4788320000000000000
1977-01-01	0.4493250000000000000
1978-01-01	0.7519090000000000000
1979-01-01	1.5657900000000000000
1980-01-01	1.4975600000000000000
1981-01-01	0.6830320000000000000
1982-01-01	0.8433200000000001000
1983-01-01	1.4393200000000002000
1984-01-01	1.6489700000000000000
1985-01-01	1.2754700000000000000
1986-01-01	0.4267720000000000400
1987-01-01	1.0875299999999999000
1988-01-01	1.0918299999999999000
1989-01-01	0.2869739999999999500
1990-01-01	0.2436080000000000000
1991-01-01	0.0101020000000000000
1992-01-01	0.0075769999999999995
1993-01-01	0.1773080000000000000
1994-01-01	0.1680520000000000000
1995-01-01	0.0036160000000000000
1996-01-01	0.0017090000000000000
1997-01-01	0.0017090000000000000
1998-01-01	0.0017090000000000000
1999-01-01	0.6601920000000000000
2000-01-01	1.4778799999999999000
2001-01-01	1.6311000000000000000
2002-01-01	1.5492299999999999000
2003-01-01	1.7103000000000000000
2004-01-01	1.8117900000000002000
2005-01-01	2.1686900000000002000
2006-01-01	3.1357200000000000000
2007-01-01	3.4614300000000005000
2008-01-01	3.0251700000000000000
2009-01-01	3.3409500000000000000
2010-01-01	3.3376200000000000000
2011-01-01	2.7493000000000000000
2012-01-01	2.3268600000000000000
2013-01-01	1.8563100000000000000
2014-01-01	1.3548700000000000000
2015-01-01	1.0711800000000000000
2016-01-01	0.9673229999999999000