-86.8% is the change from 970 to 128
Calculation steps:
[( 128 - 970 ) ÷ 970] x 100 = -86.8%
Formula
Percentage change = [(128 - 970) / 970] x 100
Subtract the new number by the original number
128 - 970 = -842
-842 ÷ 970 = -0.8680412371134021
-0.8680412371134021 x 100 = -86.8%