Oof, only 90% survival rate for deminers.

Is that actual land mines or generic lost explosives and unexploded bombs?

Cause the latter is pretty common in Europe too, but I'm surprised you have actually minefields which haven't been cleared up in Australia.

France still has WWI unexploded ordnance, and keep-out areas are still being de-mined. This has been going on for a century now. About 900 tons of explosives are removed each year. Completion in 700 years at the current rate.[1]

[1] https://www.warhistoryonline.com/world-war-i/the-red-zone-la...

I imagine a lot has to do with motivation. Canada has UXO that it doesn't clean up as land is abundant.