(svn r23826) -Fix [FS#4972]: the detailed performance rating window showed the cargo count of the current quarter instead of the last quarter like the tooltip says

src/graph_gui.cpp

@@ -717,7 +717,7 @@ struct DeliveredCargoGraphWindow : BaseGraphWindow {
 
 	virtual OverflowSafeInt64 GetGraphData(const Company *c, int j)
 	{
-		return c->old_economy[j].delivered_cargo;
+		return c->old_economy[j].delivered_cargo.GetSum<OverflowSafeInt64>();
 	}
 };