(2) "Fees" as used in this section includes fees due the department by a person, each month, year, or other fixed time or period, the amount of which is based upon the quantity, volume, weight or other measurement of some article, product or commodity and such fees to be used by the department in carrying out or enforcing a law under its jurisdiction. "Fees" does not include a license fee, the exact amount of which is fixed by law. [1961 c.425 §2; 1973 c.794 §26]