nofib oldest GHC to support?

Do we have a policy on the oldest GHC to support in nofib? I'm currently doing some hacking on nofib to parse some new info printed by a modified GHC, and I think we can do a lot of cleaning (at the very least remove some regexes and parsers) if we decide on which GHCs to support. I checked the README and RunningNoFib wiki page but couldn't see anything relevant. Thanks Ömer