China's economy expanded 2.3% in 2020 compared to a year earlier, its slowest pace in over four decades, official data showed. The country's GDP climbed 6.5% in the fourth quarter over a year earlier, propelled by stronger-than-expected growth output, the statistics bureau said. The GDP grew 4.9% in the third quarter. Economists expect China's GDP to expand 8.2% in 2021.