Year	Ratio
1970-01-01	0.532899975776672
1971-01-01	0.590979993343353
1972-01-01	0.571889996528625
1973-01-01	0.577679991722107
1974-01-01	0.596580028533936
1975-01-01	0.637610018253326
1976-01-01	0.643660008907318
1977-01-01	0.648159980773926
1978-01-01	0.660820007324219
1981-01-01	0.687799990177155
1982-01-01	0.697109997272491
1983-01-01	0.737869977951050
1984-01-01	0.736549973487854
1988-01-01	0.805859982967377
1989-01-01	0.822109997272491
1990-01-01	0.839089989662170
1991-01-01	0.828809976577759
1992-01-01	0.832560002803802
1993-01-01	0.813570022583008
1994-01-01	0.848439991474152
1995-01-01	0.856809973716736
1996-01-01	0.863030016422272
1999-01-01	0.953740000724792
2000-01-01	0.968219995498657
2001-01-01	0.981679975986481
2002-01-01	0.987489998340607
2003-01-01	0.986479997634888
2004-01-01	0.991419970989227
2005-01-01	0.989489972591400
2006-01-01	1.008039951324460
2007-01-01	1.010689973831180
2008-01-01	0.998799979686737
2009-01-01	1.000519990921020
2010-01-01	1.013069987297060
2011-01-01	1.011160016059880
2012-01-01	1.033100008964540
2013-01-01	0.976390004158020
2014-01-01	0.999499976634979
2015-01-01	1.010319948196410
2016-01-01	1.036960005760190