The size of payments, both ways, depends on the prosperity of the country, and its size (number of inhabitants)
So a country that is underdeveloped gets help to improve. A rich country chips in more.
Payments per head from the UK are lower than from some smaller countries, but because we have one of the largest populations it adds up to a bigger total.
Look on the bright side.
With our car industry and financial services sector fleeing to countries that are staying in the EU, our prosperity is falling behind. Will you be pleased when that results in us chipping in less?
Do you look forward to the day when you live in a country that qualifies for grants and loans to rebuild its crumbling infrastructure?
BTW you will be pleased to see that the UK spends much, much more on cultural projects, such as the Royal Opera House or the National Theatre, than it contributes to the EU. I bet you're a keen opera lover. Or maybe you're a Morris dancer.
What's the smallest slice of the national pie shown here?