I don't see how this solves the problem?

If Country A is spending 10% of it's GDP on 10 things, Country B cannot possibly outspend it in every category as a percentage of their respective GDPs, because "percentage of GDP" is always a 100-point scale.

If you go up one percent in one category, you have to go down one percent somewhere in the other categories.

Don't forget that us Americans pay 120% of what we should be paying, so there are extra percent points to go around.