Year	Ratio
1970-01-01	0.826439976692200
1971-01-01	0.882309973239899
1972-01-01	0.861559987068176
1973-01-01	0.949360013008118
1974-01-01	1.048910021781920
1975-01-01	1.079489946365360
1976-01-01	1.141530036926270
1977-01-01	1.197379946708680
1978-01-01	1.138859987258910
1979-01-01	1.184730052948000
1980-01-01	1.201320052146910
1981-01-01	1.245859980583190
1983-01-01	1.188599944114690
1984-01-01	1.149600028991700
1985-01-01	1.131979942321780
1986-01-01	1.097329974174500
1987-01-01	1.045869946479800
1988-01-01	1.036589980125430
1989-01-01	1.079710006713870
1990-01-01	1.111179947853090
1991-01-01	1.176830053329470
1992-01-01	1.158689975738530
1993-01-01	1.137459993362430
1994-01-01	1.098530054092410
1995-01-01	1.100450038909910
1998-01-01	1.085450053215030
1999-01-01	1.068179965019230
2000-01-01	1.065400004386900
2001-01-01	1.048959970474240
2002-01-01	1.056929945945740
2003-01-01	1.053599953651430
2004-01-01	1.043650031089780
2005-01-01	1.029620051383970
2006-01-01	1.054190039634700
2007-01-01	1.055799961090090
2008-01-01	1.091140031814580