Year	Ratio
1971-01-01	0.461470007896423
1972-01-01	0.479849994182587
1973-01-01	0.514219999313354
1974-01-01	0.549250006675720
1975-01-01	0.593450009822845
1976-01-01	0.636359989643097
1977-01-01	0.786379992961884
1978-01-01	0.822189986705780
1979-01-01	0.843209981918335
1980-01-01	0.908039987087250
1981-01-01	0.958840012550354
1982-01-01	0.989719986915588
1983-01-01	0.999319970607758
1984-01-01	1.024790048599240
1985-01-01	1.050340056419370
1986-01-01	1.138100028038020
1987-01-01	1.107710003852840
1988-01-01	1.203830003738400
1989-01-01	1.204380035400390
1990-01-01	1.215170025825500
1991-01-01	1.185660004615780
1992-01-01	1.197090029716490
1993-01-01	1.202260017395020
1994-01-01	1.210000038146970
1995-01-01	1.250460028648380
1996-01-01	1.280730009078980
1997-01-01	1.330680012702940
1998-01-01	1.356359958648680
1999-01-01	1.395190000534060
2000-01-01	1.454929947853090
2001-01-01	1.506039977073670
2002-01-01	1.529410004615780
2003-01-01	1.533519983291630
2004-01-01	1.523159980773930
2005-01-01	1.523569941520690
2006-01-01	1.538200020790100
2007-01-01	1.573909997940060
2008-01-01	1.614730000495910
2009-01-01	1.631860017776490
2010-01-01	1.615419983863830
2011-01-01	1.587059974670410
2012-01-01	1.577559947967530
2013-01-01	1.501309990882870
2014-01-01	1.448330044746400
2015-01-01	1.455800056457520
2016-01-01	1.477509975433350