Year	Ratio
1970-01-01	0.633710026741028
1971-01-01	0.629779994487762
1972-01-01	0.643459975719452
1975-01-01	0.832459986209869
1976-01-01	0.750620007514954
1977-01-01	0.734870016574860
1978-01-01	0.736949980258942
1979-01-01	0.666859984397888
1980-01-01	0.774240016937256
1983-01-01	0.748449981212616
1984-01-01	0.761690020561218
1985-01-01	0.781289994716644
1986-01-01	0.799430012702942
1987-01-01	0.815550029277802
1993-01-01	0.852479994297028
1994-01-01	0.863390028476715
1995-01-01	0.861570000648499
1996-01-01	0.854279994964600
1997-01-01	0.875140011310577
1998-01-01	0.876999974250793
1999-01-01	0.914889991283417
2000-01-01	0.917490005493164
2002-01-01	0.932129979133606
2003-01-01	0.945209980010986
2004-01-01	0.951719999313354
2005-01-01	0.958440005779266
2006-01-01	0.999040007591248
2007-01-01	1.010689973831180
2008-01-01	1.032379984855650
2009-01-01	1.066249966621400
2010-01-01	1.079550027847290
2011-01-01	1.106299996376040
2012-01-01	1.126449942588810
2013-01-01	1.121140003204350
2014-01-01	1.126710057258610
2015-01-01	1.125480055809020
2016-01-01	1.141810059547420