Just found an article in an old Australian Flying Mag from Nov 1987 when they interviewed one of the tower controllers. In it the controller says they have a around 1700 movements on each day on weekends and 1000 movements on each week day. So that's a 8400 movements each week and 436800 movements per year.
Just came across this thread and have to say 1700 on a weekend day would have been normal in the late eighties when I worked there.