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
Depopulation of Italy
In consequence of such a social condition the Latin stock in Italy underwent an alarming diminution, and its fair provinces were overspread partly by parasitic immigrants, partly by sheer desolation. A considerable portion of the population of Italy flocked to foreign lands. Already the aggregate amount of talent and of working power, which the supply of Italian magistrates and Italian garrisons for the whole domain of the Mediterranean demanded, transcended the resources of the peninsula, especially as the elements thus sent abroad were in great part lost for ever to the nation.
For the more that the Roman community grew into an empire embracing many nations, the more the governing aristocracy lost the habit of looking on Italy as their exclusive home; while of the men levied or enlisted for service a considerable portion perished in the many wars, especially in the bloody civil war, and another portion became wholly estranged from their native country by the long period of service, which sometimes lasted for a generation. In like manner with the public service, speculation kept a portion of the landholders and almost the whole body of merchants all their lives or at any rate for a long time out of the country, and the demoralising itinerant life of trading in particular estranged the latter altogether from civic existence in the mother country and from the various conditions of family life.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=118