Year	Ratio
1971-01-01	0.996510028839111
1972-01-01	0.998040020465851
1973-01-01	0.999679982662201
1974-01-01	1.000730037689210
1975-01-01	0.994599997997284
1976-01-01	0.991670012474060
1977-01-01	0.991659998893738
1978-01-01	0.990880012512207
1979-01-01	0.990249991416931
1980-01-01	0.989080011844635
1981-01-01	0.986850023269653
1982-01-01	0.987619996070862
1983-01-01	0.985989987850189
1984-01-01	0.984780013561249
1985-01-01	0.992529988288879
1986-01-01	0.994740009307861
1987-01-01	0.996680021286011
1988-01-01	0.999189972877502
1989-01-01	0.999010026454926
1990-01-01	0.997229993343353
1991-01-01	0.996070027351379
1992-01-01	0.996230006217957
1993-01-01	0.995599985122681
1994-01-01	0.996070027351379
1995-01-01	0.995679974555969
1996-01-01	0.998759984970093
1997-01-01	1.002840042114260
1998-01-01	1.009320020675660
1999-01-01	1.016610026359560
2000-01-01	1.021510004997250
2001-01-01	1.023609995841980
2002-01-01	1.022539973258970
2003-01-01	1.021870017051700
2004-01-01	1.019320011138920
2005-01-01	1.015210032463070
2006-01-01	1.012199997901920
2007-01-01	1.008530020713810
2008-01-01	1.006070017814640
2009-01-01	1.002120018005370
2010-01-01	0.998210012912750
2011-01-01	0.997210025787354
2012-01-01	0.995930016040802
2013-01-01	0.996909976005554
2014-01-01	0.997290015220642
2015-01-01	1.000079989433290
2016-01-01	0.999570012092590