Year	Ratio
1971-01-01	0.260100007057190
1972-01-01	0.278659999370575
1973-01-01	0.263020008802414
1974-01-01	0.275860011577606
1975-01-01	0.299519985914230
1976-01-01	0.339029997587204
1977-01-01	0.322100013494492
1978-01-01	0.362850010395050
1979-01-01	0.369560003280640
1980-01-01	0.409570008516312
1981-01-01	0.418709993362427
1982-01-01	0.489980012178421
1983-01-01	0.476500004529953
1984-01-01	0.506579995155334
1985-01-01	0.514959990978241
1986-01-01	0.548860013484955
1987-01-01	0.563059985637665
1988-01-01	0.561179995536804
1989-01-01	0.560299992561340
1990-01-01	0.639159977436066
1991-01-01	0.650250017642975
1992-01-01	0.671220004558563
1993-01-01	0.707279980182648
1994-01-01	0.715129971504211
1995-01-01	0.723789989948273
2002-01-01	0.859740018844604
2003-01-01	0.888059973716736
2004-01-01	0.849430024623871
2005-01-01	0.896619975566864
2006-01-01	0.916920006275177
2007-01-01	0.874840021133423
2008-01-01	0.899689972400665
2009-01-01	0.923269987106323
2010-01-01	0.864359974861145
2011-01-01	0.993110001087189
2012-01-01	0.987330019474030
2013-01-01	1.014600038528440
2014-01-01	1.051679968833920
2015-01-01	1.138870000839230
2016-01-01	1.187839984893800