-65.81% is the change from 939 to 321
Calculation steps:
[( 321 - 939 ) ÷ 939] x 100 = -65.81%
Formula
Percentage change = [(321 - 939) / 939] x 100
Subtract the new number by the original number
321 - 939 = -618
-618 ÷ 939 = -0.65814696485623
-0.65814696485623 x 100 = -65.81%