-33.97% is the change from 939 to 620
Calculation steps:
[( 620 - 939 ) ÷ 939] x 100 = -33.97%
Formula
Percentage change = [(620 - 939) / 939] x 100
Subtract the new number by the original number
620 - 939 = -319
-319 ÷ 939 = -0.3397231096911608
-0.3397231096911608 x 100 = -33.97%