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 province of Gaul," it was said in a sketch drawn ten years before Caesar's arrival, "is full of merchants; it swarms with Roman burgesses. No native of Gaul transacts a piece of business without the intervention of a Roman; every penny, that passes from one hand to another in Gaul, goes through the account books of the Roman burgesses."
From the same description it appears that in addition to the colonists of Narbo there were Romans cultivating land and rearing cattle, resident in great numbers in Gaul; as to which, however, it must not be overlooked that most of the provincial land possessed by Romans, just like the greater part of the English possessions in the earliest times in America, was in the hands of the high nobility living in Italy, and those farmers and graziers consisted for the most part of their stewards--slaves or freedmen.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=9