-14.43% is the change from 970 to 830
Calculation steps:
[( 830 - 970 ) ÷ 970] x 100 = -14.43%
Formula
Percentage change = [(830 - 970) / 970] x 100
Subtract the new number by the original number
830 - 970 = -140
-140 ÷ 970 = -0.14432989690721648
-0.14432989690721648 x 100 = -14.43%