Maybe 1980, but after thinking about it a while I'm leaning toward 1979. I'd have to ask my folks, if they remember accurately.
Note: the textual commentary of this TR is Rated PG. Due to the relative G-rating of this forum, this is posted separately. Please go here to see this TR with commentary. If you'll flip out over some minor frank terminology or a few starred-out words along with a rant or two, you might want to just look at the pictures here. Tampering = withdrawal. No debates. It was, overall, a pretty good time.