-90.95% is the change from 939 to 85
Calculation steps:
[( 85 - 939 ) ÷ 939] x 100 = -90.95%
Formula
Percentage change = [(85 - 939) / 939] x 100
Subtract the new number by the original number
85 - 939 = -854
-854 ÷ 939 = -0.9094781682641108
-0.9094781682641108 x 100 = -90.95%