Source can be downloaded from the EU website: https://europa.eu/eurobarometer/api/deliverable/download/file?deliverableId=97983
It’s linked to on this page (near the bottom in the “infographics” section): https://europa.eu/eurobarometer/surveys/detail/3492
It’s sad that those 20% are the ones who vote and all the others stay at home and don’t vote. Gotta protect our democracy like that 💪