Year	Ratio
1971-01-01	1.098049998283390
1972-01-01	1.090450048446660
1973-01-01	1.079939961433410
1974-01-01	1.016720056533810
1975-01-01	1.082759976387020
1977-01-01	1.095180034637450
1978-01-01	1.105200052261350
1979-01-01	1.108510017395020
1980-01-01	1.114480018615720
1981-01-01	1.201560020446780
1982-01-01	1.114220023155210
1983-01-01	1.109910011291500
1985-01-01	1.089900016784670
1986-01-01	1.085279941558840
1987-01-01	1.077939987182620
1988-01-01	1.073019981384280
1989-01-01	1.070670008659360
1990-01-01	1.067950010299680
1991-01-01	1.054700016975400
1992-01-01	1.049909949302670
1993-01-01	1.042140007019040
1994-01-01	0.997529983520508
1995-01-01	0.990639984607697
1996-01-01	0.992340028285980
1997-01-01	0.993579983711243
1998-01-01	0.996060013771057
1999-01-01	0.999960005283356
2000-01-01	1.002179980278020
2001-01-01	1.005640029907230
2002-01-01	1.006119966506960
2003-01-01	1.010089993476870
2004-01-01	1.005540013313290
2005-01-01	1.003960013389590
2006-01-01	1.001670002937320
2007-01-01	1.001829981803890
2008-01-01	1.001639962196350
2009-01-01	1.002470016479490
2010-01-01	1.007809996604920
2011-01-01	1.006430029869080
2012-01-01	1.004080057144170
2013-01-01	1.009520053863530
2014-01-01	1.012290000915530
2015-01-01	1.008559942245480