public void AddInfluence(HistoricEventInfluence influence)
 {
     Influences.Add(influence);
 }
        public static void SetHistoricEventInfluence(HistoricEventInfluence e, Boolean onEndDate)
        {
            double value = onEndDate ? -e.Value : e.Value;

            switch (e.Type)
            {
                case HistoricEventInfluence.InfluenceType.PassengerDemand:
                    PassengerHelpers.ChangePaxDemand(value);
                    break;
                case HistoricEventInfluence.InfluenceType.FuelPrices:
                    double percent = (100 - value)/100;
                    GameObject.GetInstance().FuelPrice = GameObject.GetInstance().FuelPrice*percent;
                    break;
                case HistoricEventInfluence.InfluenceType.Stocks:
                    break;
            }
        }