Update app.py

app.py

@@ -253,7 +253,7 @@ if show_exact_matches:
             
             # Format the year range
             start_year_str = f"{int(round(float(start_year)))}" if start_year else "Unknown"
-            end_year_str = f"{int(round(float(end_year_)))}" if end_year_ else "Unknown"
+            end_year_str = f"{int(round(float(end_year)))}" if end_year else "Unknown"
             
             # Build the final string
             if matched_countries: