-96.8% is the change from 970 to 31
Calculation steps:
[( 31 - 970 ) ÷ 970] x 100 = -96.8%
Formula
Percentage change = [(31 - 970) / 970] x 100
Subtract the new number by the original number
31 - 970 = -939
-939 ÷ 970 = -0.9680412371134021
-0.9680412371134021 x 100 = -96.8%