Year	Ratio
1970-01-01	0.884010016918182
1971-01-01	0.793449997901917
1972-01-01	0.792919993400574
1973-01-01	0.788609981536865
1974-01-01	0.803520023822784
1975-01-01	0.824119985103607
1976-01-01	0.846059978008270
1977-01-01	0.835240006446838
1978-01-01	0.851239979267120
1979-01-01	0.856800019741058
1980-01-01	0.881579995155334
1983-01-01	0.988229990005493
1984-01-01	1.024070024490360
1988-01-01	1.093299984931950
1989-01-01	1.014430046081540
1991-01-01	1.108279943466190
1992-01-01	1.061259984970090
1993-01-01	1.051659941673280
1998-01-01	0.955439984798431
1999-01-01	0.943350017070770
2000-01-01	0.960650026798248
2001-01-01	0.972320020198822
2002-01-01	0.974219977855682
2003-01-01	0.988120019435883
2004-01-01	0.991569995880127
2005-01-01	1.000450015068050
2006-01-01	1.014379978179930
2007-01-01	1.015380024909970
2008-01-01	1.007709980010990
2009-01-01	0.997780025005341
2010-01-01	0.994319975376129
2011-01-01	0.985289990901947
2012-01-01	0.986029982566834
2013-01-01	0.997600018978119
2014-01-01	1.006090044975280
2015-01-01	1.007709980010990
2016-01-01	0.998730003833771