Vanishingly small?
Without even resorting to Google:
Moorabbin - two aircraft collide over Carrum inbound. A 152 and pilot are lost.
Moorabbin - two aircraft collide on final, lives lost
Jandakot - A Cessna mows down a recreational aircraft on final from behind, luckily both pilots escape
Latrobe Valley - A Cessna mowes down a light aircraft on final from behind, pilot is lost
Bankstown - Cessna and Liberty collide, a pilot is lost
Hoxton park (yes I know it's closed) - two aircraft collide, two people lost
I don't think that can be considered "statistically zero."