def sum_all_enduses_fueltype(data_enduses, fueltype_str=False):
    """Sum across all enduses and fueltypes
    TODO
    """
    y_values_enduse_yrs = {}
    for year in data_enduses.keys():
        for enduse in data_enduses[year].keys():
            tot_across_fueltypes = data_enduses[year][enduse]
            try:
                y_values_enduse_yrs[year] += tot_across_fueltypes
            except KeyError:
                y_values_enduse_yrs[year] = tot_across_fueltypes
    return y_values_enduse_yrs
