Does anyone know where to find historical credit ratings for government bonds (S&P scale, preferably)?

For example, I know that US & Canada have their gov. bonds rated since 1941 and 1949, respectively, but I can't find their all time ratings. Like, a list of which rating they received every year since then.

Does anyone know a database with such information? And, if possible, that includes more countries than just US & Canada?

Submitted April 21, 2017 at 04:02PM by Foldeister http://ift.tt/2p01wo8