[update] 济南测试平台-同比环比优化

signal-optimize-service/src/main/java/net/wanji/opt/service/impl/TrendServiceImpl.java

@@ -306,7 +306,7 @@ public class TrendServiceImpl implements TrendService {
             return 0.0;
         }
         Double lastCongestionIndex = lastHistPO.getCongestionIndex();
-        return Math.abs((congestionIndex - lastCongestionIndex))/ lastCongestionIndex * 100;
+        return (congestionIndex - lastCongestionIndex)/ lastCongestionIndex * 100;
     }
 
     private static class CrossComparator implements Comparator<AbnormalCrossListVO> {