code: public int getZoomLevelProgress(int zoomLevel) {
  		Integer zoomProgress = zoomLevelProgress.get(zoomLevel);
  		if (zoomProgress == null) {
  			zoomProgress = 0;
  		}
  		return zoomProgress;
  	}
docs: Get the total progress at the zoom level
  
  @param zoomLevel
  zoom level
  @return progress