Year	Ratio
1970-01-01	0.0540100000798702
1971-01-01	0.2437199950218200
1972-01-01	0.2198199927806850
1974-01-01	0.3153800070285800
1976-01-01	0.3740600049495700
1977-01-01	0.3899500072002410
1978-01-01	0.3912799954414370
1979-01-01	0.4189800024032590
1982-01-01	0.4706000089645390
1983-01-01	0.4883500039577480
1984-01-01	0.5042399764060970
1985-01-01	0.5322499871253970
1986-01-01	0.5482100248336790
1988-01-01	0.6046800017356870
1991-01-01	0.5985100269317630
1992-01-01	0.7471200227737430
1993-01-01	0.7591099739074710
1994-01-01	0.7748699784278870
1995-01-01	0.7837200164794920
1996-01-01	0.7995799779891970
1997-01-01	0.8189899921417240
1998-01-01	0.8358100056648250
1999-01-01	0.8551099896430970
2000-01-01	0.8767600059509280
2001-01-01	0.8941799998283390
2002-01-01	0.9114199876785280
2003-01-01	0.9422399997711180
2004-01-01	0.9718999862670900
2005-01-01	0.9770500063896180
2006-01-01	0.9884099960327150
2007-01-01	0.9929100275039670
2008-01-01	1.0124499797821000
2009-01-01	1.0208100080490100
2010-01-01	1.0255000591278100
2011-01-01	1.0176199674606300
2012-01-01	1.0187499523162800
2013-01-01	1.0136300325393700
2014-01-01	1.0171099901199300
2015-01-01	1.0119199752807600
2016-01-01	1.0067499876022300