-89.67% is the change from 958 to 99
Calculation steps:
[( 99 - 958 ) ÷ 958] x 100 = -89.67%
Formula
Percentage change = [(99 - 958) / 958] x 100
Subtract the new number by the original number
99 - 958 = -859
-859 ÷ 958 = -0.8966597077244259
-0.8966597077244259 x 100 = -89.67%