Chinese protectionism/censorship (they only allow 34 Hollywood movies a year) has helped incubate a domestic film industry. … As of now, 9 out of 10 of the highest grossing films in Chinese history are domestic, all released in the last few years. …
Another curious finding from the author James McMahon … is that Russia — along with India and China — has the least intersection with American cultural consumption. That is, they have the lowest correlations between films that do well in the US box office and in their own.
Correlations of how well a film does in the US compared to various countries
This seems to largely be a map of cultural closeness to the US. Australia, Britain, New Zealand, and South Africa are all in the top 5 closest countries to the US.