I mean other than the unofficial rumors you may have heard around the virtual water cooler. This graph was created by importing User Group data from the past six years into the graphing software UserGroup Pro 1.9.9.9b.
Any inaccuracies are probably due to bugs in the Beta version.
It was November, 1993. I had been working with Dave Rohr only a month or so. One day at lunch he asked me if there was a Mac User Group in town. I didn't think so. I didn't want to step on his rose colored glasses and dampen his newbie enthusiasm.