AgencyRatingOutlookDate
DBRSAAA Stable Mar 21 2012
Moody'sAaa Stable Sep 30 1997
S&PAAA Stable Nov 08 1990
S&PAAA Negative Jun 26 1989
Moody'sAa1 Stable Jul 13 1987
Moody'sAaa Stable Jan 12 1978
S&PAAA N/A Jul 09 1975
S&PBBB N/A Sep 09 1958