In country areas there were only 2 television stations in the 1980s. Stuff just got shown over and over. Even the capital cities only had 4 TV stations at the time, and cable didn't exist.
So yeah, I saw it multiple times on the telly, I think it was shown way more than twice.
What I find interesting about this is that somehow Lucasfilm or CBS kept it from being shown more than once everywhere else...but somehow Australia was special. Either that, or the TV stations were just ignoring any mandates they were given!
I'll likely be moving to Melbourne to join my wife down under by sometime next year. What better place for me, I suppose, than the land where the Holiday Special showed over and over again...