-4.02% is the change from 970 to 931
Calculation steps:
[( 931 - 970 ) ÷ 970] x 100 = -4.02%
Formula
Percentage change = [(931 - 970) / 970] x 100
Subtract the new number by the original number
931 - 970 = -39
-39 ÷ 970 = -0.04020618556701031
-0.04020618556701031 x 100 = -4.02%