Question related to Sensitivity Report (Solver)

Suppose that you start with 5 less units of transportation (18 instead of
23). How much would you be willing to pay to get back those 5 units?

Shall I come up with a new sensitivity report where my Transportation constraint is equal to a maximum of 18 units? Or I can find the price I would be willing to pay from the original sensitivity report?

I attached the excel file in Zip format.

Many Thanks in Advance.