wikipedia says that more recent scholars favor a total of 80 to 100. Reconstructions like the one at the top also assume that they all stood at the same time. But they were built over a period of around 200 years, and chronicles tell us that some of them fell down before they were even finished. The number that were standing at any given moment would have been less and possibly much less. I think the above image of the town in 1590 might give a better idea of what the medieval town looked like.