Year	Ratio
1970-01-01	0.321880012750626
1972-01-01	0.380380004644394
1976-01-01	0.401969999074936
1982-01-01	0.464549988508224
1983-01-01	0.483489990234375
1984-01-01	0.463710010051727
1985-01-01	0.488330006599426
1993-01-01	0.667909979820251
1995-01-01	0.634100019931793
1996-01-01	0.546429991722107
1999-01-01	0.836920022964478
2000-01-01	0.887459993362427
2001-01-01	0.769620001316071
2002-01-01	0.869029998779297
2003-01-01	0.798099994659424
2004-01-01	0.792299985885620
2006-01-01	0.907010018825531
2007-01-01	0.986530005931854
2008-01-01	0.919409990310669
2009-01-01	0.963590025901794
2010-01-01	0.900309979915619
2011-01-01	0.882499992847443
2012-01-01	1.069460034370420
2013-01-01	1.134080052375790
2014-01-01	1.131539940834050
2015-01-01	1.134299993515010
2016-01-01	1.113280057907100