Traduction de «weakest ever since » (Néerlandais → Français) :

This increase makes it possible to move from the 2007 inspection schedule, which was the weakest ever since the introduction of these arrangements, to a more optimistic one for 2008.
This increase makes it possible to move from the 2007 inspection schedule, which was the weakest ever since the introduction of these arrangements, to a more optimistic one for 2008.