@classmethod
def _create_meters_by_bits(cls, figure, data_by_year, shifts, bits):
    """Meters passed by one average bit."""
    met_by_bit = figure.add_subplot(223)
    meters_by_bits1 = data_by_year[shifts[0]].meters / bits[0]
    meters_by_bits2 = data_by_year[shifts[1]].meters / bits[1]
    met_by_bit.plot(data_by_year[shifts[0]].month, meters_by_bits1, marker=
        'D', markersize=4)
    met_by_bit.plot(data_by_year[shifts[1]].month, meters_by_bits2, marker=
        'D', markersize=4)
    met_by_bit.legend(['Смена 1', 'Смена 2'])
    met_by_bit.set_ylabel('метров / коронку')
    met_by_bit.set_xlabel('месяцы')
    met_by_bit.grid(b=True, linestyle='--', linewidth=0.5)
    met_by_bit.set_title('Проход одной коронки.')
