Year	Ratio
1971-01-01	0.929369986057281
1972-01-01	0.919160008430481
1973-01-01	1.017490029335020
1974-01-01	1.100119948387150
1975-01-01	1.176650047302250
1976-01-01	1.228039979934690
1977-01-01	1.283169984817500
1978-01-01	1.278180003166200
1979-01-01	1.294139981269840
1980-01-01	1.302680015563960
1981-01-01	1.316630005836490
1982-01-01	1.317659974098210
1983-01-01	1.283049941062930
1984-01-01	1.287989974021910
1985-01-01	1.296939969062810
1986-01-01	1.309440016746520
1987-01-01	1.321480035781860
1988-01-01	1.334759950637820
1989-01-01	1.327610015869140
1990-01-01	1.470929980278020
1991-01-01	1.327890038490300
1992-01-01	1.355129957199100
1993-01-01	1.307139992713930
1994-01-01	1.366659998893740
1995-01-01	1.412639975547790
1996-01-01	1.454069972038270
1997-01-01	1.463230013847350
1998-01-01	1.369899988174440
1999-01-01	1.379809975624080
2000-01-01	1.409389972686770
2001-01-01	1.438650012016300
2002-01-01	1.431890010833740
2003-01-01	1.427780032157900
2004-01-01	1.413589954376220
2005-01-01	1.412209987640380
2006-01-01	1.407379984855650
2007-01-01	1.407739996910100
2008-01-01	1.421550035476680
2009-01-01	1.441519975662230
2010-01-01	1.522410035133360
2011-01-01	1.569020032882690
2012-01-01	1.568079948425290
2013-01-01	1.565140008926390
2014-01-01	1.536419987678530
2015-01-01	1.515079975128170
2016-01-01	1.514899969100950