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 suppression of piracy, which found dangerous lurking-places in the Baleares, through the occupation of these islands by Quintus Caecilius Metellus in 631, was singularly conducive, to the prosperity of Spanish commerce; and in other respects also the fertile islands, inhabited by a dense population which was unsurpassed in the use of the sling, were a valuable possession. How numerous the Latin-speaking population in the peninsula was even then, is shown by the settlement of 3000 Spanish Latins in the towns of Palma and Pollentia (Pollenza) in the newly-acquired islands. In spite of various grave evils the Roman administration of Spain preserved on the whole the stamp which the Catonian period, and primarily Tiberius Gracchus, had impressed on it.
It is true that the Roman frontier territory had not a little to suffer from the inroads of the tribes, but half subdued or not subdued at all, on the north and west. Among the Lusitanians in particular the poorer youths regularly congregated as banditti, and in large gangs levied contributions from their countrymen or their neighbours, for which reason, even at a much later period, the isolated homesteads in this region were constructed in the style of fortresses, and were, in case of need, capable of defence; nor did the Romans succeed in putting an end to these predatory habits in the inhospitable and almost inaccessible Lusitanian mountains.
But what had previously been wars assumed more and more the character of brigandage, which every tolerably efficient governor was able to repress with his ordinary resources; and in spite of such inflictions on the border districts Spain was the most flourishing and best-organized country in all the Roman dominions; the system of tenths and the middlemen were there unknown; the population was numerous, and the country was rich in corn and cattle.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=29