EU is slightly over 448 million people vs 332 million in the USA.
4.233 million km² in EU vs 9.833 million km^2^ in the USA.
91 billion USD equivalent support from EU (including the EU organization and EU members) versus 75 billion USD from the USA.
91/75 = 1.213...
448/332 = 1.349
If you want per capita you get 0.203 (unit not given, they are the same for each comparison) per capita from EU, versus 0.225 per capita from the USA. The numbers based on area will be a lot worse for the USA.
To be clear; yes, the USA has contributed a little more per capita, but less in absolute terms. There's a maximum of 35% difference in the populations between the EU and the USA. That's "very comparable" when it comes to such large populations.
A true grammar Nazi would obviously know that it is a proper contraction. No true Scotsman and all that ;P