Year	Ratio
1976-01-01	0.937569975852966
1977-01-01	0.926010012626648
1978-01-01	0.938139975070953
1979-01-01	0.960659980773926
1980-01-01	0.973930001258850
1981-01-01	0.950720012187958
1982-01-01	0.737569987773895
1984-01-01	0.976549983024597
1985-01-01	0.861850023269653
1986-01-01	0.733269989490509
1987-01-01	0.991010010242462
1988-01-01	0.973779976367950
1989-01-01	0.974210023880005
1990-01-01	0.944949984550476
1991-01-01	0.991829991340637
1992-01-01	0.967279970645905
1993-01-01	0.980750024318695
1994-01-01	0.986689984798431
1995-01-01	1.013730049133300
1998-01-01	0.979849994182587
2000-01-01	1.035599946975710
2001-01-01	1.091140031814580
2002-01-01	1.054100036621090
2003-01-01	1.022179961204530
2004-01-01	1.050469994544980
2005-01-01	1.018829941749570
2007-01-01	0.999400019645691
2008-01-01	1.014170050621030
2009-01-01	1.016399979591370
2010-01-01	1.001119971275330
2011-01-01	1.019680023193360
2012-01-01	1.012459993362430
2013-01-01	1.032950043678280
2014-01-01	1.018319964408870
2015-01-01	1.020720005035400