Year	Ratio
1971-01-01	1.008290052413940
1972-01-01	1.007230043411250
1973-01-01	1.006870031356810
1974-01-01	1.007069945335390
1975-01-01	1.007599949836730
1976-01-01	1.008159995079040
1977-01-01	1.008069992065430
1978-01-01	1.008209943771360
1979-01-01	1.008499979972840
1981-01-01	1.009080052375790
1982-01-01	1.009170055389400
1983-01-01	1.009330034255980
1984-01-01	0.969910025596619
1985-01-01	0.970109999179840
1986-01-01	0.970179975032806
1987-01-01	0.970409989356995
1988-01-01	0.970380008220673
1989-01-01	1.004889965057370
1990-01-01	1.003530025482180
1991-01-01	1.006060004234310
1992-01-01	1.167039990425110
1993-01-01	1.010969996452330
1994-01-01	1.002820014953610
1995-01-01	0.998969972133636
1996-01-01	0.992160022258759
1997-01-01	0.999639987945557
1998-01-01	0.998120009899139
1999-01-01	0.993189990520477
2000-01-01	0.995630025863647
2001-01-01	0.990970015525818
2002-01-01	0.987280011177063
2003-01-01	0.984170019626617
2004-01-01	0.986169993877411
2005-01-01	0.985790014266968
2006-01-01	0.992060005664825
2007-01-01	0.992519974708557
2008-01-01	0.992770016193390
2009-01-01	0.995480000972748
2010-01-01	0.995970010757446
2011-01-01	0.994499981403351
2012-01-01	0.999149978160858
2013-01-01	1.000789999961850
2014-01-01	1.000319957733150
2015-01-01	1.003700017929080