Tesla Inc.’s sales plummeted 59% last month in Germany, adding to indications that Chief Executive Officer’s Elon Musk political activities are hurting the carmaker’s business in major electric vehicle markets.

Tesla posted lower sales across five EU countries as competitors with newer models gained and polls show public opinion souring on CEO Musk.

Tesla sales in a number of major European markets nearly halved in January, partly because of calendar year effects as well as some owners holding off for the new facelifted Model Y.