Year	Ratio
1970-01-01	0.826089978218079
1971-01-01	0.825089991092682
1972-01-01	0.827820003032684
1973-01-01	0.827610015869141
1974-01-01	0.840020000934601
1975-01-01	0.841239988803864
1976-01-01	0.846830010414124
1977-01-01	0.846549987792969
1978-01-01	0.851249992847443
1979-01-01	0.846340000629425
1980-01-01	0.847050011157990
1981-01-01	0.850629985332489
1982-01-01	0.870630025863647
1983-01-01	0.854600012302399
1985-01-01	0.847069978713989
1986-01-01	0.849009990692139
1991-01-01	0.869180023670197
1992-01-01	0.868130028247833
1993-01-01	0.869310021400452
1994-01-01	0.863520026206970
1995-01-01	0.866419970989227
1996-01-01	0.865949988365173
1997-01-01	0.870310008525848
1998-01-01	0.877009987831116
1999-01-01	0.878300011157990
2000-01-01	0.904219985008240
2001-01-01	0.911360025405884
2002-01-01	0.920830011367798
2004-01-01	0.932060003280640
2005-01-01	0.938289999961853
2006-01-01	0.945100009441376
2007-01-01	0.953079998493195
2008-01-01	0.958880007266998
2009-01-01	0.971459984779358
2010-01-01	0.979719996452332
2011-01-01	0.984019994735718
2012-01-01	0.978349983692169
2013-01-01	0.972509980201721
2014-01-01	0.970589995384216
2015-01-01	0.968940019607544
2016-01-01	0.967790007591248