Year	Ratio
1971-01-01	0.770680010318756
1972-01-01	0.769060015678406
1973-01-01	0.795029997825623
1974-01-01	0.794820010662079
1975-01-01	0.814549982547760
1976-01-01	0.834990024566650
1977-01-01	0.855830013751984
1978-01-01	0.874909996986389
1979-01-01	0.887499988079071
1980-01-01	0.908800005912781
1981-01-01	0.919910013675690
1982-01-01	0.924160003662109
1983-01-01	0.934660017490387
1984-01-01	0.939429998397827
1985-01-01	0.945529997348785
1986-01-01	0.956359982490540
1987-01-01	0.969460010528564
1988-01-01	0.975210011005402
1989-01-01	0.981119990348816
1990-01-01	0.988529980182648
1991-01-01	0.992359995841980
1992-01-01	0.977169990539551
1997-01-01	0.974500000476837
1998-01-01	0.971329987049103
1999-01-01	0.981949985027313
2000-01-01	0.975960016250610
2001-01-01	0.994499981403351
2002-01-01	0.988759994506836
2003-01-01	0.984399974346161
2004-01-01	0.992590010166168
2005-01-01	1.007109999656680
2006-01-01	1.033179998397830
2007-01-01	1.024710059165950
2008-01-01	1.030009984970090
2009-01-01	1.028839945793150
2010-01-01	1.025709986686710
2011-01-01	1.029320001602170
2012-01-01	1.021170020103450
2013-01-01	1.022220015525820
2014-01-01	1.022699952125550
2015-01-01	1.011409997940060
2016-01-01	0.996410012245178