Year	Ratio
1970-01-01	1.005879998207090
1971-01-01	1.004369974136350
1972-01-01	0.999710023403168
1973-01-01	1.003610014915470
1974-01-01	0.997770011425018
1975-01-01	0.997470021247864
1976-01-01	0.993610024452209
1977-01-01	0.993579983711243
1978-01-01	1.004739999771120
1979-01-01	0.990270018577576
1980-01-01	0.990310013294220
1981-01-01	0.986829996109009
1982-01-01	0.982819974422455
1984-01-01	0.989730000495911
1985-01-01	0.996219992637634
1986-01-01	0.984420001506805
1987-01-01	0.994180023670197
1988-01-01	1.047510027885440
1990-01-01	0.988049983978271
1991-01-01	0.990029990673065
1996-01-01	0.988420009613037
1997-01-01	0.998920023441315
1998-01-01	0.989539980888367
1999-01-01	1.000550031661990
2000-01-01	0.994920015335083
2001-01-01	0.996169984340668
2002-01-01	0.996399998664856
2003-01-01	0.995270013809204
2004-01-01	0.992340028285980
2005-01-01	0.990570008754730
2006-01-01	0.993059992790222
2007-01-01	0.995450019836426
2008-01-01	0.994229972362518
2009-01-01	0.993879973888397
2010-01-01	0.986100018024445
2011-01-01	0.986779987812042
2012-01-01	0.986590027809143
2013-01-01	0.989740014076233
2014-01-01	0.995940029621124
2015-01-01	0.996720016002655