-97.81% is the change from 958 to 21
Calculation steps:
[( 21 - 958 ) ÷ 958] x 100 = -97.81%
Formula
Percentage change = [(21 - 958) / 958] x 100
Subtract the new number by the original number
21 - 958 = -937
-937 ÷ 958 = -0.9780793319415448
-0.9780793319415448 x 100 = -97.81%