Year	Ratio
1980-01-01	0.295100003480911
1983-01-01	0.315849989652634
1984-01-01	0.305990010499954
1985-01-01	0.314190000295639
1986-01-01	0.337639987468719
1995-01-01	0.465279996395111
1996-01-01	0.668600022792816
1998-01-01	0.578750014305115
1999-01-01	0.570089995861053