-80.64% is the change from 439 to 85
Calculation steps:
[( 85 - 439 ) ÷ 439] x 100 = -80.64%
Formula
Percentage change = [(85 - 439) / 439] x 100
Subtract the new number by the original number
85 - 439 = -354
-354 ÷ 439 = -0.806378132118451
-0.806378132118451 x 100 = -80.64%