[richforrester]

What I love about these types of questions is that they come completely out of the blue

Like someone will rock up and ask for some stat that's completely irrelevant to the story, just "to make a point", without looking it up first themselves, just to imply something

And then later backtrack with "I WAS JUST ASKING" or something

Nah, go look it up yourself. Define successful for yourself, look up the statistic

Look for things like "happiest countries in the world", "GDP per capita", "life expectancy" or even "Big Mac index". Heck, make up your own index from a mix of them