internal TransfersStatistics(string version)
 {
     _data        = new BuildingTransfersStorage[2];
     _data[0]     = new BuildingTransfersStorage();
     _data[1]     = new BuildingTransfersStorage();
     this.version = version;
 }
 internal void UpdateStatistics()
 {
     _data[1] = _data[0];
     _data[0] = new BuildingTransfersStorage();
 }