-51.65% is the change from 939 to 454
Calculation steps:
[( 454 - 939 ) ÷ 939] x 100 = -51.65%
Formula
Percentage change = [(454 - 939) / 939] x 100
Subtract the new number by the original number
454 - 939 = -485
-485 ÷ 939 = -0.516506922257721
-0.516506922257721 x 100 = -51.65%