33. The duties payable for a fiscal year shall not be higher than the amount by which three times the amount of the duties that would be payable on the average annual profit of the last three fiscal years, including the fiscal year in question, exceeds the greater of the amounts of the duties actually paid for the last two fiscal years and the duties that would have been paid had no deduction been made under section 34.
In computing the duties that would be payable on the average annual profit, the exemption provided by section 30 shall not exceed the average of the exemptions that have been applied to the last three fiscal years, including the fiscal year in question.
No fiscal year of less than fifty-two weeks shall be included in that period unless otherwise provided and on the conditions fixed by regulation.
1975, c. 30, s. 33; 1979, c. 74, s. 3.