TheAirline.Models.Airports.Airport.AddCargoDestinationStatistics C# (CSharp) Method

        public void AddCargoDestinationStatistics(Airport destination, double cargo)
        {
            lock (DestinationCargoStatistics)
            {
                if (!DestinationCargoStatistics.ContainsKey(destination))
                {
                    DestinationCargoStatistics.Add(destination, cargo);
                }
                else
                {
                    DestinationCargoStatistics[destination] += cargo;
                }
            }
        }