Not necessarily measure it, but you can spot it a mile away. Not just in rugby but in any sport. Think of Manchester United or Real Madrid fans in say, Bangkok or LA. Think of people who will have the latest shirt when their playing the final but will never stay awake till 3 am (time difference) to watch the game unless it's an event.
Again, I don't think there is anything wrong with that, but i can at the very least understand the rationale of people who do.
But that goes without saying. It's hardly rocket science.
Maybe that's the problem.
Is that supposed to be cryptic?
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The population is one of the factors but hardly the most important one, particularly for a sport like rugby. Focus is actually more important. Their best athletes, since day one, are focusing on rugby.
This, with all due respect, sir, I already know.