diff --git a/ProjectGSM/Documents/ChartReport.cs b/ProjectGSM/Documents/ChartReport.cs
index 432c2bd..394ad4e 100644
--- a/ProjectGSM/Documents/ChartReport.cs
+++ b/ProjectGSM/Documents/ChartReport.cs
@@ -43,7 +43,7 @@ public class ChartReport
         }
     }
 
-    public List<(string, double)> GetData(DateTime dateTime)
+    private List<(string, double)> GetData(DateTime dateTime)
     {
         try
         {