Nope but a web search might yeild the results, I used to think they were relatively rare, but after pursuing every CJ8 lead I get within so many miles i have seen a number of them. Factory as well.
If I had to take a very very rough guess I would say 25 to 33 percent.
The reason for this larger number of autos than you typically see in CJ7s may be because CJ8's tended to be built as a higher line vehicle slathered with extra packages (and lets face it they werent cheap in the day compared to other vehicles! The window sticker for my 82 is over 12,000).