Year	Ratio
1971-01-01	0.891420006752014
1972-01-01	0.906769990921021
1973-01-01	0.937529981136322
1974-01-01	0.924399971961975
1975-01-01	0.933000028133392
1976-01-01	0.940469980239868
1977-01-01	0.947979986667633
1978-01-01	0.954219996929169
1979-01-01	0.963410019874573
1980-01-01	0.967379987239838
1981-01-01	0.975979983806610
1982-01-01	0.994149982929230
1983-01-01	0.994859993457794
1984-01-01	0.995540022850037
1985-01-01	0.999279975891113
1986-01-01	1.005769968032840
1987-01-01	1.009400010108950
1988-01-01	1.011309981346130
1989-01-01	1.014760017395020
1990-01-01	1.007599949836730
1991-01-01	1.006029963493350
1992-01-01	1.006070017814640
1994-01-01	1.032979965209960
1995-01-01	1.035640001297000
1996-01-01	1.034559965133670
1997-01-01	1.031039953231810
1998-01-01	1.022459983825680
1999-01-01	1.015359997749330
2000-01-01	1.007920026779170
2001-01-01	1.007329940795900
2002-01-01	1.006729960441590
2003-01-01	1.000749945640560
2004-01-01	0.990310013294220
2005-01-01	0.989859998226166
2006-01-01	0.990440011024475
2007-01-01	0.994499981403351
2008-01-01	0.985809981822968
2009-01-01	0.989530026912689
2010-01-01	0.987030029296875
2011-01-01	0.982010006904602
2012-01-01	0.982540011405945
2013-01-01	1.005429983139040
2014-01-01	1.005810022354130
2015-01-01	1.005879998207090
2016-01-01	0.999740004539490