The Chinese economy stumbled in 2022, numbers released Tuesday show, in one of its worst performances in decades as growth was dragged down by numerous Covid lockdowns followed by a deadly outbreak in December that swept across the country with remarkable speed. China grew 3 percent for the year — less than half what it was in 2021 and far short of Beijing’s target of 5.5 percent. Other than 2020, it was the most disappointing showing since 1976, the year after the death of Mao Zedong when the economy declined…