Since no analytical accounts were available for the period 1987 to 1992, the experts allocated costs to inter-regional scheduled bus services on the basis of the percentage of revenue generated by those same services during that period.
Kuna ajavahemiku 1987–1992 kohta puudus kuluarvestus, jaotasid eksperdid piirkondadevahelise liiniveo kulu vastavalt samadest teenustest sel ajavahemikul saadud tulu protsentuaalsele osakaalule.