>>149738565
80s
North America: 20
Europe: 18
Australia: 1

90s:
North America: 22
Europe: 14
Oceania: 2
South America: 2

00s
Europe: 28
North America: 6
South America: 4
Oceania: 2

10s:
Europe: 40

20s:
Europe: 21

Last non-European slam winner was Del Potro in US09.
USA never really dominated though even prior to 2000, Europe's numbers were close