-33.87% is the change from 939 to 621
Calculation steps:
[( 621 - 939 ) ÷ 939] x 100 = -33.87%
Formula
Percentage change = [(621 - 939) / 939] x 100
Subtract the new number by the original number
621 - 939 = -318
-318 ÷ 939 = -0.33865814696485624
-0.33865814696485624 x 100 = -33.87%