Year	Ratio
1981-01-01	0.306349992752075
1984-01-01	6.420169830322270
1985-01-01	2.037420034408570
1989-01-01	3.777699947357180
1991-01-01	0.806649982929230
1992-01-01	1.436619997024540
1993-01-01	1.004140019416810