Year	Ratio
1970-01-01	0.753620028495789
1971-01-01	1.043400049209590
1972-01-01	1.013489961624150
1974-01-01	0.793229997158051
1975-01-01	2.385200023651120
1976-01-01	3.022190093994140
1977-01-01	0.869229972362518
1978-01-01	0.857249975204468
1979-01-01	0.880739986896515
1980-01-01	0.847130000591278
1981-01-01	0.870329976081848
1982-01-01	0.876649975776672
1985-01-01	0.899280011653900
1991-01-01	0.932219982147217
1995-01-01	0.933749973773956
1998-01-01	0.942480027675629
1999-01-01	0.937179982662201
2000-01-01	0.929840028285980
2001-01-01	0.932269990444183
2002-01-01	0.932770013809204
2003-01-01	0.943069994449615
2004-01-01	0.981249988079071
2005-01-01	0.980300009250641
2006-01-01	0.992680013179779
2007-01-01	0.995559990406036
2008-01-01	1.002480030059810
2009-01-01	0.993809998035431
2010-01-01	1.004310011863710
2011-01-01	1.003610014915470
2012-01-01	0.983190000057220
2013-01-01	0.996330022811890
2014-01-01	0.997560024261475
2015-01-01	1.000570058822630
2016-01-01	0.996940016746521