-18.84% is the change from 791 to 642
Calculation steps:
[( 642 - 791 ) ÷ 791] x 100 = -18.84%
Formula
Percentage change = [(642 - 791) / 791] x 100
Subtract the new number by the original number
642 - 791 = -149
-149 ÷ 791 = -0.18836915297092288
-0.18836915297092288 x 100 = -18.84%