Year	Ratio
1970-01-01	0.508740007877350
1971-01-01	1.215360045433040
1972-01-01	0.577660024166107
1973-01-01	0.666939973831177
1974-01-01	0.398350000381470
1975-01-01	0.408800005912781
1985-01-01	0.610360026359558
1986-01-01	0.535650014877319
2003-01-01	1.198439955711360
2004-01-01	1.196149945259090
2005-01-01	1.193760037422180