Statista reports:
Looking at global GDP at constant 2017 prices, but adjusted for purchasing power/cost of living, China was the biggest economy in the world in 2019, with an adjusted GDP of more than $22.5 trillion, according to the World Bank.
While the Chinese economy is projected by the International Monetary Fund to grow by a low 1.2% in 2020 due to the coronavirus pandemic, the U.S. in second rank is expected to see its $20.6 trillion GDP decrease by almost 6%.
By 2030, India is expected to overtake the U.S. as the second-largest economy on the planet. At that time China is also supposed to be the biggest economy in the world in terms of nominal GDP, a record still held by the U.S.
Source: Statista