-32.57% is the change from 958 to 646
Calculation steps:
[( 646 - 958 ) ÷ 958] x 100 = -32.57%
Formula
Percentage change = [(646 - 958) / 958] x 100
Subtract the new number by the original number
646 - 958 = -312
-312 ÷ 958 = -0.325678496868476
-0.325678496868476 x 100 = -32.57%