Year	Ratio
1971-01-01	1.044409990310670
1972-01-01	0.990930020809174
1973-01-01	0.961809992790222
1974-01-01	0.948780000209808
1975-01-01	0.984549999237061
1976-01-01	1.076460003852840
1977-01-01	1.065179944038390
1978-01-01	1.067729949951170
1979-01-01	1.070809960365300
1980-01-01	1.058439970016480
1987-01-01	1.047129988670350
1988-01-01	1.046779990196230
1989-01-01	1.044420003890990
1990-01-01	1.043009996414180
1998-01-01	1.044170022010800
2008-01-01	0.970040023326874
2009-01-01	0.969139993190765
2010-01-01	0.967899978160858
2011-01-01	0.967249989509583
2012-01-01	0.964810013771057
2013-01-01	0.975619971752167
2014-01-01	0.981689989566803
2015-01-01	0.985679984092712
2016-01-01	0.984019994735718