Canada may make you happier as a comparison, TSB provides information on their total accidents, and they are operating around 2.7 times the fleet size that Australia does. Their total accidents per year is around 20-30% more than Australia varying over time. Their number of MAC's in the last 13 years, excluding RCAF, is... 0. [3] Canada has a similar level of concentration of population centers, and has similar uncontrolled airspace regs to Aus.
I'm not sure where your stats on Canadian MACs come from but a search of the TSB for the keywords "mid air" database shows 1-2 per year for the last few years.
https://www.tsb.gc.ca/eng/rapports-r...ion/index.html