Year	Ratio
1971-01-01	0.999300003051758
1972-01-01	0.997470021247864
1973-01-01	0.997969985008240
1974-01-01	0.999459981918335
1975-01-01	1.002030014991760
1976-01-01	1.004520058631900
1977-01-01	1.004559993743900
1978-01-01	1.004639983177190
1979-01-01	1.004379987716670
1980-01-01	1.004629969596860
1981-01-01	1.004549980163570
1982-01-01	1.004220008850100
1983-01-01	1.003000020980830
1984-01-01	0.999149978160858
1985-01-01	1.003780007362370
1986-01-01	1.004080057144170
1987-01-01	1.003990054130550
1988-01-01	1.003200054168700
1989-01-01	1.004609942436220
1990-01-01	1.004320025444030
1991-01-01	1.006760001182560
1992-01-01	1.001539945602420
1998-01-01	0.998849987983704
1999-01-01	1.000659942626950
2000-01-01	1.000679969787600
2001-01-01	1.001170039176940
2002-01-01	1.001350045204160
2003-01-01	1.001719951629640
2004-01-01	1.000640034675600
2005-01-01	0.998969972133636
2006-01-01	1.004719972610470
2007-01-01	1.004009962081910
2008-01-01	0.996599972248077
2009-01-01	0.997020006179810
2010-01-01	0.994579970836639
2011-01-01	0.998730003833771
2012-01-01	0.999729990959167
2013-01-01	0.997820019721985
2014-01-01	0.998199999332428
2015-01-01	0.998839974403381