KELLY SERVS INC. B DL 1 revenue for the last year amounted to 4.38 B EUR, the most of which — 1.34 B EUR — came from its highest performing source at the moment, Professional & Industrial, the year earlier bringing 1.56 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought KELLY SERVS INC. B DL 1 3.22 B EUR, and the year before that — 3.43 B EUR.