-99.57% is the change from 939 to 4
Calculation steps:
[( 4 - 939 ) ÷ 939] x 100 = -99.57%
Formula
Percentage change = [(4 - 939) / 939] x 100
Subtract the new number by the original number
4 - 939 = -935
-935 ÷ 939 = -0.9957401490947817
-0.9957401490947817 x 100 = -99.57%