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 Budget of Income
In addition to these fundamental reforms a thorough revision of the income and expenditure took place. The ordinary sources of income were everywhere regulated and fixed. Exemption from taxation was conferred on not a few communities and even on whole districts, whether indirectly by the bestowal of the Roman or Latin franchise, or directly by special privilege; it was obtained e. g. by all the Sicilian communities(41) in the former, by the town of Ilion in the latter way.
41. Varro attests the discontinuance of the Sicilian -decumae- in a treatise published after Cicero's death (De R. R. 2 praef.) where he names--as the corn--provinces whence Rome derives her subsistence--only Africa and Sardinia, no longer Sicily. The -Latinitas-, which Sicily obtained, must thus doubtless have included this immunity (comp. Staatsrecht, iii. 684).
Still greater was the number of those whose proportion of tribute was lowered; the communities in Further Spain, for instance, already after Caesar's governorship had on his suggestion a reduction of tribute granted to them by the senate, and now the most oppressed province of Asia had not only the levying of its direct taxes facilitated, but also a third of them wholly remitted.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=79