-54.95% is the change from 939 to 423
Calculation steps:
[( 423 - 939 ) ÷ 939] x 100 = -54.95%
Formula
Percentage change = [(423 - 939) / 939] x 100
Subtract the new number by the original number
423 - 939 = -516
-516 ÷ 939 = -0.549520766773163
-0.549520766773163 x 100 = -54.95%