Update app.py

app.py

@@ -36,6 +36,9 @@ collection_name = "giz_worldwide"
 client = get_client()
 print(client.get_collections())
 
+# Get the maximum end_year across the entire collection
+max_end_year = get_max_end_year(client, collection_name)
+
 # Get all unique sub-regions
 _, unique_sub_regions = get_regions(region_df)