India & China mostly for Aus at least.
We issued 281k student visas last year, can’t find it now but I recall ~170k of those were Indians and as everyone knows that system is being abused for cheap labour. 
Discussion
I'd say there has also been a significant burst from Latin America, from my anecdotal evidence, of seeing/hearing heeeeaps of spanish-speaking folks around Adelaide.
Not that it matters much to me... because I am also an immigrant as a dirty yank 😅
But a dual-citizen and been in Oz for 12yrs now. US/AU are basically synonymous in culture, so it doesn't feel like we're that different beyond accents.
Although, recently I have found, since Trump, a growing animosity towards Americans lol
Haven’t seen much of that in Melbourne, mostly Indian & Chinese & Vietnamese here.
You triggered my memory though, remember when the Spanish-speaking student was working a cashie at a Woodville pizza shop and didn’t want to tell anyone, and blueblood Chief Public Health Officer Nicola Spurrier having zero worldly experience thought Adelaide had developed Supercovid that could be passed by pizzaboxes so she locked everything down in a few hours and wreaked absolute mayhem rather than think someone might not want to tell the Gov they were working illegally? Good times..