Australia had that, too, almost every day up until day 16. We also very nearly beat Japan (mostly let down by our team sports). It's not really all that unusual...

If you watched the diving, though, those three countries absolutely annihilated the competition, with China winning every single gold on offer, both men's and women's, lol...

It was insane. First time I've ever personally witnessed (on tv, at least) scores over 100.

The US mostly dominates swimming (as does Aus) and track (which Aus does not)...