Year	Ratio
1971-01-01	1.045379996299740
1972-01-01	1.046159982681270
1973-01-01	1.046890020370480
1974-01-01	1.047479987144470
1975-01-01	1.047090053558350
1976-01-01	1.046579957008360
1977-01-01	1.045910000801090
1978-01-01	1.046219944953920
1979-01-01	1.047880053520200
1980-01-01	1.050729990005490
1982-01-01	1.069880008697510
1983-01-01	1.070739984512330
1984-01-01	1.068140029907230
1985-01-01	1.065170049667360
1986-01-01	1.062690019607540
1987-01-01	1.181650042533870
1988-01-01	1.180459976196290
1989-01-01	0.947189986705780
1990-01-01	0.915679991245270
1991-01-01	0.971199989318848
1992-01-01	1.043079972267150
1993-01-01	1.068379998207090
1994-01-01	1.012920022010800
1995-01-01	1.031360030174260
1996-01-01	1.035330057144170
1997-01-01	1.035480022430420
1998-01-01	1.050179958343510
1999-01-01	1.045250058174130
2000-01-01	1.021209955215450
2001-01-01	1.034250020980830
2002-01-01	1.031069993972780
2003-01-01	1.029070019721980
2004-01-01	1.016149997711180
2005-01-01	1.018479943275450
2006-01-01	1.017130017280580
2007-01-01	1.014359951019290
2008-01-01	1.013370037078860
2009-01-01	1.012390017509460
2010-01-01	1.005920052528380
2011-01-01	1.002040028572080
2012-01-01	1.001989960670470
2013-01-01	1.007159948349000
2014-01-01	1.004750013351440
2015-01-01	1.009580016136170