Year	Ratio
1971-01-01	0.973110020160675
1972-01-01	0.997169971466064
1973-01-01	1.011710047721860
1974-01-01	0.842779994010925
1975-01-01	0.921679973602295
1976-01-01	0.998510003089905
1977-01-01	0.977729976177216
1978-01-01	0.972000002861023
1979-01-01	0.973940014839172
1980-01-01	0.987190008163452
1981-01-01	0.997799992561340
1982-01-01	0.968559980392456
1983-01-01	0.941600024700165
1984-01-01	0.998099982738495
1985-01-01	0.959529995918274
1989-01-01	1.008129954338070
1990-01-01	0.992429971694946
1992-01-01	1.001579999923710
1999-01-01	0.983600020408630
2000-01-01	0.981050014495850
2001-01-01	0.988740026950836
2002-01-01	0.990840017795563
2003-01-01	0.980009973049164
2004-01-01	0.980199992656708
2005-01-01	0.996110022068024
2006-01-01	0.980379998683929
2007-01-01	1.006819963455200
2008-01-01	1.001899957656860
2009-01-01	1.007580041885380
2010-01-01	1.016680002212520
2011-01-01	1.000540018081670
2014-01-01	1.011190056800840
2015-01-01	1.004430055618290
2016-01-01	1.013700008392330