@classmethod
def _create_meters_by_month(cls, figure, data_by_year, shifts):
    """Totall drill meters in month by each shift."""
    met_bu_mon = figure.add_subplot(221)
    met_bu_mon.plot(data_by_year[shifts[0]].month, data_by_year[shifts[0]].
        meters, marker='D', markersize=4)
    met_bu_mon.plot(data_by_year[shifts[1]].month, data_by_year[shifts[1]].
        meters, marker='D', markersize=4)
    met_bu_mon.legend(['Смена 1', 'Смена 2'])
    met_bu_mon.set_ylabel('шпурометры, м.')
    met_bu_mon.grid(b=True, linestyle='--', linewidth=0.5)
    met_bu_mon.set_title('Пробурено за смену.')
