def METHOD_NAME(cls, dirpath):
    """
    Extract production volumes from the EXIOBASE data file.
    Parameters
    ----------
    dirpath : str
        The path of the EXIOBASE data file or directory.
    Returns
    -------
    dict
        A dictionary for the production volume.
    """
    if not (dirpath / "x.txt").is_file():
        return {}
    with (dirpath / "x.txt").open() as csvfile:
        reader = csv.DictReader(csvfile, delimiter="\t")
        data = {
            (row["sector"], row["region"]): float(row["indout"]) for row in reader
        }
    return data