-15.39% is the change from 981 to 830
Calculation steps:
[( 830 - 981 ) ÷ 981] x 100 = -15.39%
Formula
Percentage change = [(830 - 981) / 981] x 100
Subtract the new number by the original number
830 - 981 = -151
-151 ÷ 981 = -0.15392456676860347
-0.15392456676860347 x 100 = -15.39%