Year	Ratio
1971-01-01	0.740119993686676
1972-01-01	0.803279995918274
1973-01-01	0.872810006141663
1974-01-01	0.924179971218109
1975-01-01	0.762730002403259
1976-01-01	0.813579976558685
1977-01-01	0.763310015201569
1978-01-01	0.746330022811890
1979-01-01	0.904799997806549
1980-01-01	0.919579982757568
1981-01-01	0.947369992733002
1982-01-01	0.998480021953583
1983-01-01	1.018049955368040
1984-01-01	1.224670052528380
1985-01-01	1.136710047721860
1986-01-01	1.172819972038270
1987-01-01	1.078189969062810
1991-01-01	1.287469983100890
1992-01-01	1.565780043601990
1993-01-01	1.305279970169070
1994-01-01	1.346400022506710
1995-01-01	1.335190057754520
1996-01-01	1.329740047454830
1998-01-01	1.307520031929020
1999-01-01	1.302659988403320
2000-01-01	1.337649941444400
2001-01-01	1.367869973182680
2002-01-01	1.371770024299620
2003-01-01	1.352699995040890
2004-01-01	1.326939940452580
2005-01-01	1.307279944419860
2006-01-01	1.283040046691890
2007-01-01	1.216369986534120
2008-01-01	1.192260026931760
2009-01-01	1.183050036430360
2010-01-01	1.181620001792910
2011-01-01	1.189759969711300
2012-01-01	1.181750059127810
2013-01-01	1.153290033340450
2014-01-01	1.157449960708620
2015-01-01	1.133110046386720
2016-01-01	1.115520000457760