Year	Ratio
1971-01-01	1.126049995422360
1972-01-01	1.178030014038090
1973-01-01	1.028920054435730
1974-01-01	1.013299942016600
1975-01-01	0.986370027065277
1976-01-01	1.001760005950930
1977-01-01	1.004529953002930
1978-01-01	1.006960034370420
1979-01-01	1.008880019187930
1980-01-01	1.014400005340580
1981-01-01	1.081869959831240
1982-01-01	1.023699998855590
1983-01-01	1.015969991683960
1984-01-01	1.004670023918150
1985-01-01	1.001209974288940
1986-01-01	0.984160006046295
1987-01-01	0.967000007629395
1988-01-01	0.953279972076416
1989-01-01	0.932219982147217
1990-01-01	0.947350025177002
1991-01-01	0.947749972343445
1992-01-01	0.932359993457794
1993-01-01	0.926519989967346
1997-01-01	0.930060029029846
1999-01-01	0.946129977703094
2000-01-01	0.968400001525879
2001-01-01	0.954469978809357
2002-01-01	0.968970000743866
2003-01-01	0.950060009956360
2004-01-01	0.947979986667633
2005-01-01	0.955399990081787
2006-01-01	0.919730007648468
2007-01-01	0.949570000171661