Year	Ratio
1971-01-01	0.763040006160736
1972-01-01	0.808990001678467
1973-01-01	0.833079993724823
1974-01-01	0.875999987125397
1975-01-01	0.950100004673004
1976-01-01	0.971300005912781
1977-01-01	1.003460049629210
1978-01-01	1.024449944496150
1979-01-01	1.168319940567020
1980-01-01	0.729189991950989
1986-01-01	1.150200009346010
1988-01-01	1.138720035552980
1990-01-01	1.005259990692140
1991-01-01	1.160680055618290
1993-01-01	1.139639973640440
1994-01-01	1.088580012321470
1995-01-01	1.077790021896360
1996-01-01	1.090119957923890
1998-01-01	1.077909946441650
1999-01-01	1.081930041313170
2000-01-01	1.066810011863710
2001-01-01	1.057180047035220
2002-01-01	1.049839973449710
2003-01-01	1.091289997100830
2004-01-01	1.106220006942750
2005-01-01	1.099850058555600
2006-01-01	1.088909983634950
2007-01-01	1.074339985847470
2008-01-01	1.058230042457580
2009-01-01	1.043319940567020
2010-01-01	1.028100013732910
2011-01-01	1.018569946289060
2012-01-01	0.998889982700348
2013-01-01	0.984780013561249
2014-01-01	0.976140022277832
2015-01-01	0.969479978084564
2016-01-01	0.973420023918152