-3.2% is the change from 970 to 939
Calculation steps:
[( 939 - 970 ) ÷ 970] x 100 = -3.2%
Formula
Percentage change = [(939 - 970) / 970] x 100
Subtract the new number by the original number
939 - 970 = -31
-31 ÷ 970 = -0.031958762886597936
-0.031958762886597936 x 100 = -3.2%