[perl4ever]

I think what's stopping other countries is that only one can be at the top of a relative ranking.

[QasimK]

But there’s nothing that stops countries from being within 5% of each other at top of that ranking. The main point is the large difference between the countries.

[ferkad]

I think there is more into it:

  "It has maintained its position as the clear leader for the past 26 years."