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 system of compromises followed for forty years was at an end. The Gracchan constitution, still spared in the first Sullan reform of 666, was now utterly set aside. Since the time of Gaius Gracchus the government had conceded, as it were, the right of -'emeute- to the proletariate of the capital, and bought it off by regular distributions of corn to the burgesses domiciled there; Sulla abolished these largesses. Gaius Gracchus had organized and consolidated the order of capitalists by the letting of the tenths and customs of the province of Asia in Rome; Sulla abolished the system of middlemen, and converted the former contributions of the Asiatics into fixed taxes, which were assessed on the several districts according to the valuation-rolls drawn up for the purpose of gathering in the arrears.(9)
9. That Sulla's assessment of the five years' arrears and of the war expenses levied on the communities of Asia (Appian, Mithr. 62 et al.) formed a standard for the future, is shown by the facts, that the distribution of Asia into forty districts is referred to Sulla (Cassiodor. Chron. 670) and that the Sullan apportionment was assumed as a basis in the case of subsequent imposts (Cic. pro Flacc. 14, 32), and by the further circumstance, that on occasion of building a fleet in 672 the sums applied for that purpose were deducted from the payment of tribute (-ex pecunia vectigali populo Romano-: Cic. Verr. l. i. 35, 89). Lastly, Cicero (ad Q. fr. i. i, ii, 33) directly says, that the Greeks "were not in a position of themselves to pay the tax imposed on them by Sulla without -publicani-."
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=19