-56.87% is the change from 939 to 405
Calculation steps:
[( 405 - 939 ) ÷ 939] x 100 = -56.87%
Formula
Percentage change = [(405 - 939) / 939] x 100
Subtract the new number by the original number
405 - 939 = -534
-534 ÷ 939 = -0.5686900958466453
-0.5686900958466453 x 100 = -56.87%