21371人，北京国安vs大埔上座人数为新工体倒数第二（国安vs大埔到场21371人，新工体上座人数倒数第二）

Checking stadium details

First, I confirm that the Beijing Workers' Stadium reopened in 2023 with a capacity of 68,000. Based on 21,371 attendees, that's about 31.4%. However, I'd prefer not to state it if I'm unsure. I can say "若按约68,000座计算，上座率约31%" but will clarify it's approximate. I should ask a short question to clarify what the user needs, providing options like verifying numbers or calculating the attendance rate if they want.