Year	Ratio
1971-01-01	1.005910038948060
1972-01-01	1.005900025367740
1973-01-01	1.005589962005620
1974-01-01	1.004119992256160
1975-01-01	1.003110051155090
1976-01-01	1.001019954681400
1977-01-01	0.999710023403168
1978-01-01	0.998560011386871
1979-01-01	0.997919976711273
1980-01-01	0.998749971389771
1981-01-01	0.999249994754791
1982-01-01	1.000390052795410
1983-01-01	1.001299977302550
1984-01-01	1.001749992370610
1985-01-01	1.002279996871950
1986-01-01	1.002429962158200
1987-01-01	1.002560019493100
1988-01-01	1.002820014953610
1989-01-01	1.003020048141480
1990-01-01	1.003669977188110
1991-01-01	1.004469990730290
1992-01-01	1.005339980125430
1993-01-01	1.005749940872190
1994-01-01	1.004830002784730
1995-01-01	1.004709959030150
1996-01-01	1.006289958953860
1997-01-01	1.006029963493350
1998-01-01	1.004289984703060
1999-01-01	1.004040002822880
2000-01-01	1.003669977188110
2001-01-01	1.004220008850100
2002-01-01	1.004330039024350
2003-01-01	1.004899978637700
2004-01-01	1.004439949989320
2005-01-01	1.005249977111820
2006-01-01	1.005800008773800
2007-01-01	1.005329966545100
2008-01-01	1.004590034484860
2009-01-01	1.003859996795650
2010-01-01	1.003530025482180
2011-01-01	1.003350019454960
2012-01-01	1.003010034561160
2013-01-01	1.003020048141480
2014-01-01	1.003679990768430
2015-01-01	1.003229975700380