Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The rest of the provincial territory on the other hand, even including the free cities, was throughout liable to taxation; the only exceptions were the cities invested with the Roman franchise, such as Narbo, and the communities on which immunity from taxation was specially conferred (-civitates immunes-), such as Centuripa in Sicily. The direct taxes consisted partly--as in Sicily and Sardinia--of a title to the tenth(8) of the sheaves and other field produce as of grapes and olives, or, if the land lay in pasture, to a corresponding -scriptura-; partly--as in Macedonia, Achaia, Cyrene, the greater part of Africa, the two Spains, and by Sulla's arrangements also in Asia--of a fixed sum of money to be paid annually by each community to Rome (-stipendium-, -tributum-).
8. This tax-tenth, which the state levied from private landed property, is to be clearly distinguished from the proprietor's tenth, which it imposed on the domain-land. The former was let in Sicily, and was fixed once for all; the latter--especially that of the territory of Leontini--was let by the censors in Rome, and the proportion of produce payable and other conditions were regulated at their discretion (Cic. Verr. iii. 6, 13; v. 21, 53; de leg. agr. i. 2, 4; ii. 18, 48). Comp, my Staatsrecht, iii. 730.
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Reference address : https://www.ellopos.net/elpenor/rome/4-11-commonwealth-economy.asp?pg=8