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 capital still possessed no other bridge over the Tiber than the primitive wooden gangway, which led over the Tiber island to the Janiculum; the Tiber was still allowed to lay the streets every year under water, and to demolish houses and in fact not unfrequently whole districts, without anything being done to strengthen the banks; mighty as was the growth of transmarine commerce, the roadstead of Ostia--already by nature bad--was allowed to become more and more sanded up.
A government, which under the most favourable circumstances and in an epoch of forty years of peace abroad and at home neglected such duties, might easily allow taxes to fall into abeyance and yet obtain an annual surplus of income over expenditure and a considerable reserve; but such a financial administration by no means deserves commendation for its mere semblance of brilliant results, but rather merits the same censure-- in respect of laxity, want of unity in management, mistaken flattery of the people--as falls to be brought in every other sphere of political life against the senatorial government of this epoch.
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Reference address : https://www.ellopos.net/elpenor/rome/4-11-commonwealth-economy.asp?pg=26