-98.4% is the change from 939 to 15
Calculation steps:
[( 15 - 939 ) ÷ 939] x 100 = -98.4%
Formula
Percentage change = [(15 - 939) / 939] x 100
Subtract the new number by the original number
15 - 939 = -924
-924 ÷ 939 = -0.9840255591054313
-0.9840255591054313 x 100 = -98.4%