COLLIERS INTERNATIONAL GROUP INC. revenue for the last year amounted to 3.99 B EUR, the most of which — 980.83 M EUR — came from its highest performing source at the moment, Leasing, the year earlier bringing 1.01 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought COLLIERS INTERNATIONAL GROUP INC. 2.18 B EUR, and the year before that — 2.28 B EUR.