-81.05% is the change from 438 to 83
Calculation steps:
[( 83 - 438 ) ÷ 438] x 100 = -81.05%
Formula
Percentage change = [(83 - 438) / 438] x 100
Subtract the new number by the original number
83 - 438 = -355
-355 ÷ 438 = -0.8105022831050228
-0.8105022831050228 x 100 = -81.05%