Does this chart [1] for contributions and this [2] for net contributions (direct financial contributions minus direct financial benefits) not answer that question?
Then just figure out which portion of your countries budget comes out of your taxes, and how big the total budget of your country is, and you have your answer. It's not like this is top secret information
I wondered if that might be the case, but they're writing in English which use a comma as a thousands separator; in which case, they definitely have the decimal point in the wrong place, even if it's down to a grammatical error.
I'm not so sure they're separate, or at least that they should be treated as such. Either way, it's a shame that this isn't standardised, regardless of the language spoken. Likewise units of measurement (weight, distance, time etc.).
In school (UK) we were told to use ' as the thousands separator in mathematics as it avoids confusion i.e.
1'234.56
1'234,56
Either of these can be understood no matter which format you're used to. Although, I don't think it's ever caught on really (or whether it's even advisable/sensible).
Then just figure out which portion of your countries budget comes out of your taxes, and how big the total budget of your country is, and you have your answer. It's not like this is top secret information
1: https://www.statista.com/statistics/316691/eu-budget-contrib...
2: https://www.statista.com/chart/18794/net-contributors-to-eu-...