By JOE McDONALD BEIJING (AP) — China’s exports rose in 2020 despite pressure from the coronavirus and a tariff war with Washington, boosting its politically volatile trade surplus to $535 billion, one of the highest ever reported. Exports increased 3.6% over 2019 to $2.6 trillion, an improvement on the previous year’s 0.5% gain, customs data showed Thursday. Imports edged down 1.1% to just over $2