Year	Ratio
1971-01-01	0.484109997749329
1972-01-01	0.505609989166260
1973-01-01	0.553420007228851
1974-01-01	0.577160000801086
1975-01-01	0.582799971103668
1976-01-01	0.626569986343384
1977-01-01	0.647679984569550
1978-01-01	0.642560005187988
1979-01-01	0.688009977340698
1980-01-01	0.702489972114563
1981-01-01	0.777320027351379
1982-01-01	0.825309991836548
1983-01-01	0.883740007877350
1984-01-01	0.998170018196106
1985-01-01	1.042809963226320
1986-01-01	1.064290046691890
1987-01-01	1.067899942398070
1988-01-01	1.048840045928960
1989-01-01	1.034000039100650
1990-01-01	1.055719971656800
1992-01-01	1.016450047492980
1993-01-01	1.042889952659610
1994-01-01	0.939629971981049
1995-01-01	1.052209973335270
1996-01-01	1.009780049324040
1997-01-01	0.995350003242493
1998-01-01	1.089050054550170
1999-01-01	1.097900032997130
2000-01-01	1.088969945907590
2001-01-01	1.141700029373170
2002-01-01	1.142490029335020
2003-01-01	1.122830033302310
2004-01-01	1.149919986724850
2005-01-01	1.114490032196040
2006-01-01	1.095849990844730
2007-01-01	1.069339990615840
2010-01-01	1.037320017814640
2011-01-01	1.015550017356870
2012-01-01	1.008030056953430
2013-01-01	0.994270026683807
2014-01-01	0.990530014038086