Year	Ratio
1976-01-01	0.916199982166290
1978-01-01	0.913129985332489
1979-01-01	0.921280026435852
1980-01-01	0.899169981479645
1981-01-01	0.895600020885468
1982-01-01	0.907999992370605
1983-01-01	0.938799977302551
1984-01-01	0.935220003128052
1985-01-01	0.912490010261536
1986-01-01	0.909389972686768
1987-01-01	0.923089981079102
1988-01-01	0.927150011062622
1989-01-01	0.927079975605011
1990-01-01	0.914780020713806
1991-01-01	0.917980015277863
1992-01-01	1.008370041847230
1993-01-01	1.047049999237060
1994-01-01	1.013839960098270
1995-01-01	0.983860015869141
1996-01-01	0.985870003700256
1997-01-01	0.961889982223511
1999-01-01	0.949199974536896
2000-01-01	0.953279972076416
2001-01-01	0.960919976234436
2004-01-01	0.951590001583099
2005-01-01	0.952350020408630
2006-01-01	0.960730016231537
2007-01-01	0.977530002593994
2008-01-01	0.983630001544952
2009-01-01	1.015650033950810
2010-01-01	0.989619970321655
2011-01-01	0.975899994373322
2012-01-01	0.965439975261688
2013-01-01	0.947740018367767
2014-01-01	0.925710022449493
2015-01-01	0.926919996738434
2016-01-01	0.929989993572235