Tesla's electric-vehicle registrations in California fell about 12% last year, according to industry data, indicating mounting challenges for the automaker in the key U.S. market.

Tesla’s registrations declined despite the company adding a fifth model — the polarizing Cybertruck — to its lineup last year.

Tesla’s sales have dropped by double digits in California, the most important EV market in the US, all while the rest of the EV market is growing. California is the biggest market for electric vehicles in the US and by a wide margin.

Tesla Inc. registrations plummeted 63% last month in France, the European Union’s second-biggest market for battery-electric vehicles.