Year	Ratio
1970-01-01	0.854340016841888
1971-01-01	0.885980010032654
1972-01-01	0.904229998588562
1973-01-01	0.930819988250732
1974-01-01	0.937539994716644
1975-01-01	0.954119980335236
1976-01-01	0.999880015850067
1977-01-01	1.029170036315920
1978-01-01	1.052389979362490
1979-01-01	1.063969969749450
1980-01-01	1.054110050201420
1981-01-01	1.065189957618710
1982-01-01	1.056519985198970
1983-01-01	1.071810007095340
1984-01-01	1.074290037155150
1991-01-01	1.083480000495910
1992-01-01	1.107980012893680
1993-01-01	1.095219969749450
1994-01-01	1.073079943656920
1998-01-01	1.061689972877500
1999-01-01	1.057729959487920
2000-01-01	1.030570030212400
2001-01-01	1.008550047874450
2002-01-01	0.986459970474243
2003-01-01	0.986790001392365
2004-01-01	0.982230007648468
2005-01-01	0.984700024127960
2006-01-01	1.004189968109130
2007-01-01	1.010319948196410
2008-01-01	1.004940032958980
2009-01-01	1.001479983329770
2010-01-01	1.006070017814640
2011-01-01	0.995360016822815
2012-01-01	1.012869954109190
2013-01-01	1.021100044250490
2014-01-01	0.999530017375946
2015-01-01	1.004230022430420
2016-01-01	1.012619972229000