Year	Ratio
1991-01-01	1.751039981842040
1994-01-01	1.569139957427980
1995-01-01	1.532909989356990
1997-01-01	1.118530035018920
1998-01-01	1.129009962081910
2001-01-01	0.826640009880066
2002-01-01	1.346279978752140
2003-01-01	1.107939958572390
2005-01-01	0.849990010261536
2006-01-01	0.847670018672943
2008-01-01	1.269099950790410