A couple of very good comments, Targa.
The stats tell a story but the real question is: Why? How much do each of the following contribute to the ability of teams to close out halves and matches:
3. Attitude / mental strength
4. Bench quality / depth
All of these are always relative as well. A team might be fit compared to a club side but if they are a lot less fit than their international opposition then that's what's telling.
I think 4. has been by far the biggest contributor the closing-out-the-game stat over the past few decades. Other teams have at times been able to have a comparable starting 15 but not a comparable bench.
I'm NOT yet doing cartwheels that Australia finally have some depth and therefore bench strength. I think we do in some positions - mostly the forwards interestingly - but we are sadly struggling for a really good starting 15 player in some positions, let along a good bench. Locks and inside backs the problem positions.
So sorry - just saw it on the 'other side'. Should have known better than to doubt the efficiency of the Roar.