Harley-Davidson Inc. barely broke even in the last quarter of a year in which the struggling American icon got caught up in President Donald Trump’s trade wars. The motorcycle maker’s shares plunged the most in a year.

Earnings per share on a GAAP basis were zero in the fourth quarter, the Milwaukee-based manufacturer said in a statement Tuesday. Excluding restructuring and tariff costs, profit was 17 cents a share, missing analysts’ average estimate for 29 cents.

Trump attacked Harley last year after it announced plans to shift some U.S. production overseas to sidestep levies imposed by the European Union. But the motorcycle maker has more than tariffs and angry tweets to blame for its performance. U.S. retail sales tumbled 10 percent in the three months ended in December, the eighth consecutive quarterly drop. Chief Executive Officer Matt Levatich is having trouble attracting younger riders and plans to offer cheaper bikes and sell more clothing and gear — including on Amazon — to reach new customers.

“2019 we expect to be another difficult year until major initiatives like More Roads start kicking in,” Levatich said in an interview, referring to a turnaround plan unveiled last year. “Everything is angled at that core issue of building riders in the U.S. and leveraging growth opportunities we have in the near term and internationally.”