Too Many Seasons!
According to imdb it started in '76 and ended in '84! I think that was way too long.
The first episode was broadcast just before I went to Secondary School and the last episode was broadcast after I had left for goodness sake. The early episodes were fun to watch, but they ran out of ideas and it went on too long.
Then again perhaps I got irritated with the show because I was growing up and maturing and it was still aimed at a younger audience.
Fun at the beginning but I later tired of it.