-82.31% is the change from 458 to 81
Calculation steps:
[( 81 - 458 ) ÷ 458] x 100 = -82.31%
Formula
Percentage change = [(81 - 458) / 458] x 100
Subtract the new number by the original number
81 - 458 = -377
-377 ÷ 458 = -0.8231441048034934
-0.8231441048034934 x 100 = -82.31%