Tesla’s TSLA -1.65%decrease; red down pointing triangle sales in the European Union slumped for a fourth consecutive month as Elon Musk’s electric-vehicle maker struggles to cash in on a growing EV market in the bloc where Chinese rivals are expanding.

New-car registrations for Tesla models, a reflection of sales, plunged nearly 53% to 5,475 vehicles across the EU last month, according to the European Automobile Manufacturers’ Association, an industry body also known as ACEA. When including the U.K., Iceland, Liechtenstein, Norway and Switzerland, sales fell 49% to 7,261 vehicles.