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