Year	Ratio
1971-01-01	0.968230009078979
1972-01-01	0.974110007286072
1973-01-01	0.978649973869324
1974-01-01	0.984290003776550
1975-01-01	0.989130020141602
1976-01-01	0.992540001869202
1977-01-01	0.997009992599487
1978-01-01	0.999170005321503
1979-01-01	1.003469944000240
1980-01-01	1.005839943885800
1981-01-01	1.006129980087280
1982-01-01	1.007979989051820
1983-01-01	1.007680058479310
1984-01-01	1.007019996643070
1985-01-01	1.007799983024600
1986-01-01	1.006500005722050
1987-01-01	1.005059957504270
1988-01-01	1.002879977226260
1989-01-01	1.002750039100650
1990-01-01	1.004160046577450
1991-01-01	1.005169987678530
1992-01-01	1.008649945259090
1993-01-01	1.012570023536680
1994-01-01	1.019729971885680
1995-01-01	1.029199957847600
1996-01-01	1.034479975700380
1997-01-01	1.028830051422120
1998-01-01	1.032039999961850
1999-01-01	1.026800036430360
2000-01-01	1.014109969139100
2001-01-01	1.005810022354130
2002-01-01	1.002359986305240
2003-01-01	0.997959971427917
2004-01-01	0.995760023593903
2005-01-01	0.992810010910034
2006-01-01	0.993309974670410
2007-01-01	0.994400024414063
2008-01-01	0.997349977493286
2009-01-01	0.999369978904724
2010-01-01	1.000589966773990
2011-01-01	1.004449963569640
2012-01-01	1.006170034408570
2013-01-01	1.006979942321780
2014-01-01	1.005679965019230
2015-01-01	1.004670023918150