Year	Ratio
1971-01-01	0.161620005965233
1972-01-01	0.149770006537437
1973-01-01	0.204929992556572
1974-01-01	0.291779994964600
1975-01-01	0.345899999141693
1976-01-01	0.387459993362427
1977-01-01	0.413580000400543
1978-01-01	0.446060001850128
1979-01-01	0.484910011291504
1980-01-01	0.498670011758804
1981-01-01	0.536880016326904
1982-01-01	0.572149991989136
1983-01-01	0.630349993705750
1984-01-01	0.693809986114502
1985-01-01	0.760770022869110
1986-01-01	0.817390024662018
1987-01-01	0.846109986305237
1988-01-01	0.868550002574921
1989-01-01	0.882809996604919
1990-01-01	0.898810029029846
1991-01-01	0.922399997711182
1992-01-01	0.930339992046356
1993-01-01	0.954200029373169
1994-01-01	0.980929970741272
1995-01-01	0.989229977130890
1996-01-01	0.969449996948242
1997-01-01	0.983539998531342
1998-01-01	0.983730018138886
1999-01-01	0.975489974021912
2000-01-01	0.969739973545074
2001-01-01	0.979309976100922
2002-01-01	0.967599987983704
2003-01-01	0.965439975261688
2005-01-01	0.987339973449707
2006-01-01	1.004879951477050
2007-01-01	0.993430018424988
2008-01-01	0.987640023231506
2009-01-01	0.960780024528503
2011-01-01	1.012840032577510
2012-01-01	1.006340026855470
2013-01-01	1.056139945983890
2014-01-01	1.056920051574710
2015-01-01	1.040639996528630
2016-01-01	1.027160048484800