Year	Ratio
1970-01-01	0.865130007266998
1973-01-01	0.884800016880035
1977-01-01	0.934849977493286
1978-01-01	0.949970006942749
1979-01-01	0.933210015296936
1980-01-01	0.945450007915497
1981-01-01	0.954750001430511
1982-01-01	0.935350000858307
1985-01-01	0.957040011882782
1991-01-01	0.972220003604889
1992-01-01	0.971409976482391
1993-01-01	0.972980022430420
1995-01-01	0.973010003566742
1998-01-01	0.986370027065277
1999-01-01	0.992179989814758
2000-01-01	0.993640005588531
2001-01-01	0.997650027275085
2002-01-01	0.999430000782013
2003-01-01	0.999979972839355
2004-01-01	1.004230022430420
2005-01-01	1.009039998054500
2006-01-01	1.009080052375790
2007-01-01	1.010740041732790
2008-01-01	1.012529969215390
2009-01-01	1.010229945182800
2010-01-01	1.010929942131040
2011-01-01	1.002879977226260
2012-01-01	0.995249986648560
2013-01-01	0.997619986534119
2014-01-01	1.000120043754580
2015-01-01	1.000090003013610
2016-01-01	1.003280043601990