Year	Ratio
1971-01-01	1.013630032539370
1972-01-01	1.224099993705750
1973-01-01	0.967220008373261
1974-01-01	1.521469950675960
1975-01-01	1.138919949531560
1976-01-01	2.027600049972530
1983-01-01	1.108669996261600