I think "per capita" is only useful in measuring the living standard, not much useful in measuring impact of innovation on overall national strength and the influence of that country to the rest of world.
Let's say country C has 5 times population of country A. Same invention is made by scientists in C and A, if everything else is equal for simplistic reason, C can build a factory 5 times of A can, producing 5 times of products of the same technological level. Now if both C and A decide to flood the rest of the world with the products for dominance, who do you think will be the standing one? Simple, it is the one who can out-produce, pressing the price down.
In real life, there is a saying in my company, "you just need one genius in the department, the rests are just willing hard workers to do the simple broken down tasks".