-13.36% is the change from 958 to 830
Calculation steps:
[( 830 - 958 ) ÷ 958] x 100 = -13.36%
Formula
Percentage change = [(830 - 958) / 958] x 100
Subtract the new number by the original number
830 - 958 = -128
-128 ÷ 958 = -0.1336116910229645
-0.1336116910229645 x 100 = -13.36%