Just under half, 42.3%. Detailed statistics: https://www.acea.auto/files/report-vehicles-in-use-europe-january-2021-1.pdf https://www.acea.auto/files/report-veh

Just under half, 42.3%. Detailed statistics: https://www.acea.auto/files/report-vehicles-in-use-europe-january-2021-1.pdf https://www.acea.auto/files/report-vehicles-in-use-europe-ja... (I checked as I didn't believe it was half, but I see there's significant variation by country.)