Year	Ratio
1971-01-01	1.036290049552920
1972-01-01	0.994029998779297
1973-01-01	0.983730018138886
1974-01-01	0.999109983444214
1976-01-01	1.043319940567020
1984-01-01	0.996209979057312
1985-01-01	0.998229980468750
1986-01-01	1.048419952392580
1987-01-01	1.036139965057370
1999-01-01	1.009760022163390
2001-01-01	1.006500005722050
2005-01-01	1.032590031623840
2007-01-01	0.985029995441437
2008-01-01	1.045799970626830
2009-01-01	1.028980016708370
2010-01-01	1.063650012016300
2011-01-01	1.053369998931880
2012-01-01	1.044440031051640