I wrote this out at one point to get it straight. I'm confident in it, but the only split of which I'm unsure is between Not Any & Not Much:
MASSIVE 28+ High-High (significantly, tremendous, sky’s the limit, massive, dramatic, huge)
SUBSTANTIAL 20 – 27.9 Low-High (above average, much, substantial, really improve, major, big, a lot, fairly significant)
GOOD 7 – 19.9 Average (good upside, decent, can improve, help improve, able to/should/could improve)
NOT MUCH 2 - 6.9 Low (not anticipating…much, don’t think/see…much more, probably not…much, etc.)
NOT ANY 0 - 1.9 Low-Low (don’t see any, doubt any, etc.)