Year	Ratio
1972-01-01	1.043230056762700
1973-01-01	1.037160038948060
1974-01-01	1.030439972877500
1989-01-01	1.045029997825620
1990-01-01	1.043720006942750
1991-01-01	1.036499977111820
1992-01-01	1.033980011940000
1993-01-01	1.001989960670470
1994-01-01	1.000499963760380
1995-01-01	1.005779981613160
1996-01-01	1.003509998321530
1997-01-01	0.999840021133423
1998-01-01	1.002329945564270
1999-01-01	0.994090020656586
2000-01-01	0.985549986362457
2001-01-01	0.979059994220734
2002-01-01	0.972270011901855
2003-01-01	0.961780011653900
2004-01-01	1.012779951095580
2005-01-01	0.993860006332397
2006-01-01	0.986800014972687
2007-01-01	0.989859998226166
2008-01-01	0.995220005512238
2009-01-01	0.997120022773743
2010-01-01	0.994809985160828
2011-01-01	0.993629992008209
2012-01-01	0.991519987583160
2013-01-01	0.967159986495972
2014-01-01	0.965860009193420
2015-01-01	0.968060016632080
2016-01-01	0.972379982471466