<prompt> Translate the following text to SwahiliThe incremental expenditures required to generate electricity under each of the four scenarios as compared to the reference case are summarized in Figure 5 in billions of 1999 dollars.  <response>: Gharama za ziada zinazohitajika kuzalisha umeme chini ya kila moja ya matukio manne ikilinganishwa na kesi ya kumbukumbu ni muhtasari katika mchoro wa 5, katika bilioni ya dola za 1999. 