9. If, in respect of any period of 100 consecutive days, the 90th percentile of the daily production of finished product other than dissolving grade sulphite pulp, of dissolving grade sulphite pulp or of bleached pulp has decreased or is expected to decrease by more than 25% in relation to the reference production rate of the mill, the operator must use an interim reference production rate not later than 31 days after the decrease occurs or after becoming aware of the expected decrease and must comply with the conditions in section 7.