-97.35% is the change from 791 to 21
Calculation steps:
[( 21 - 791 ) ÷ 791] x 100 = -97.35%
Formula
Percentage change = [(21 - 791) / 791] x 100
Subtract the new number by the original number
21 - 791 = -770
-770 ÷ 791 = -0.9734513274336283
-0.9734513274336283 x 100 = -97.35%