Year	Ratio
1979-01-01	2.840409994125370
1980-01-01	2.240109920501710
1984-01-01	2.051529884338380
1985-01-01	2.666419982910160
1986-01-01	0.727859973907471
1987-01-01	0.644909977912903
1988-01-01	0.682630002498627
1992-01-01	1.175099968910220
1993-01-01	1.223070025444030
2008-01-01	2.093039989471440
2014-01-01	1.015689969062810
2015-01-01	2.037209987640380