About how many irregular verbs would you guess that there are in English?

Without doing a Web search, what would you guess? I took a guess off the top of my head and then I started to make a list, and it became clear there were much more than I initially came up with. I made a second guess and it turned out to still be too low. Check your guess with the list given here.

I did a Web search for other languages, but could not get any numbers. From what I was able to gather, other languages also have large numbers of irregular verbs.