-51% is the change from 798 to 391
Calculation steps:
[( 391 - 798 ) ÷ 798] x 100 = -51%
Formula
Percentage change = [(391 - 798) / 798] x 100
Subtract the new number by the original number
391 - 798 = -407
-407 ÷ 798 = -0.5100250626566416
-0.5100250626566416 x 100 = -51%