-66.99% is the change from 939 to 310
Calculation steps:
[( 310 - 939 ) ÷ 939] x 100 = -66.99%
Formula
Percentage change = [(310 - 939) / 939] x 100
Subtract the new number by the original number
310 - 939 = -629
-629 ÷ 939 = -0.6698615548455804
-0.6698615548455804 x 100 = -66.99%