Question: what is UnitedHealth Group (NYSE) percentage change on the latest trading day?（based on the latest closing price and the previous closing price）
Date: 2025/8/14
Answer (translation): Required Content: The latest percentage change of UnitedHealth Group
Accuracy Requirements: Only rounding errors are allowed
Ground-truth data: UNH___N: RT_TIME: 200001
RT_PCT_CHG: 0.0391
RT_DATE: 20250813