Year	Ratio
1979-01-01	0.964630007743835
1980-01-01	1.438400030136110
1982-01-01	1.539880037307740
1983-01-01	0.947759985923767
1984-01-01	1.203480005264280
2009-01-01	1.357200026512150
2015-01-01	1.157480001449580
2016-01-01	1.279109954833980