All depends on how far away from the production date you get. I see more CJ8's than I do CJ6, but jeep made twice as many CJ6 as it did CJ8's.
That said
Jeep made a total of 50,172 CJ6's over a 26 year production run (american distribution only)
Jeep made a total of 27,792 CJ8's over a 5 year production run
Jeep made a total of 46,492 LJ's over a 3 year production run, this includes both rubi and non rubi models.
As more and more vehicles age, we see less and less of them. I was chatting with a friend the other day and it was mentioned, remember the days when you couldn't drive to the corner store with out seeing a Iroc camaro or Fox-body mustang. I almost never see them anymore. only a matter of time till you almost never see a YJ or TJ on the road.