On Thursday afternoon, Uber told financial analysts that it couldn’t forecast how much revenue it would generate this year because of the upheaval caused by the coronavirus. In February, Uber had said it expected to bring in between $16 billion and $17 billion this year.

Lyft has not yet made a similar announcement. But data collected by outside firms indicates the businesses of both companies collapsed in March.

Drawing from aggregated debit and credit card purchases of millions of U.S. consumers, for example, the analytics firm Second Measure found that spending on Uber’s rides dropped about 83 percent in March.

“I think every major metropolitan area, and really the whole country, is going to be down 70 to 80 percent,” said Tom White, a senior research analyst with the financial firm D.A. Davidson.

In Paris, one of Uber’s largest markets in Europe, Rayann Aly stopped driving after lockdowns were imposed in March. He said that business had dried up and that he was concerned for his health. Like other major cities, Paris is largely empty of traffic. The government has not provided a timeline of when the restrictions will be lifted.