Year	Ratio
1970-01-01	0.983420014381409
1971-01-01	0.990570008754730
1972-01-01	0.994189977645874
1973-01-01	0.990869998931885
1974-01-01	0.985379993915558
1975-01-01	0.979219973087311
1976-01-01	0.976520001888275
1977-01-01	0.971750020980835
1978-01-01	0.960439980030060
1979-01-01	0.971650004386902
1980-01-01	0.969699978828430
1981-01-01	0.981980025768280
1982-01-01	0.981589972972870
1983-01-01	0.986090004444122
1984-01-01	0.994120001792908
1985-01-01	0.993499994277954
1986-01-01	0.994539976119995
1987-01-01	1.000300049781800
1988-01-01	1.002239942550660
1989-01-01	1.005980014801030
1990-01-01	1.010409951210020
1991-01-01	1.010689973831180
1992-01-01	1.012889981269840
1993-01-01	1.010499954223630
1994-01-01	1.002719998359680
1995-01-01	0.997870028018951
1996-01-01	0.994159996509552
1997-01-01	0.996379971504211
1998-01-01	0.998669981956482
1999-01-01	0.998839974403381
2000-01-01	0.991270005702972
2001-01-01	0.994589984416962
2002-01-01	0.999499976634979
2003-01-01	0.999949991703033
2004-01-01	0.997940003871918
2005-01-01	0.997770011425018
2006-01-01	0.997110009193420
2007-01-01	0.998880028724670
2008-01-01	0.994329988956451
2009-01-01	1.002660036087040
2010-01-01	1.005139946937560
2011-01-01	1.008080005645750
2012-01-01	1.007470011711120
2013-01-01	1.017019987106320
2014-01-01	1.020550012588500
2015-01-01	1.017629981040950
2016-01-01	1.017899990081790