WASHINGTON (AP) — Stuck in the grip of a viral pandemic, the U.S. economy grew at a 4% annual rate in the final three months of 2020 and shrank last year by the largest amount in 74 years. For 2020 as a whole, a year when the coronavirus inflicted the worst economic freeze since the end of World War II, the economy contracted 3.5% and clouded the outlook for the coming year. The economic damage followed the eruption of the pandemic 10 months ago and the deep recession it triggered, with tens of millions of Americans left jobless.