-82.16% is the change from 454 to 81
Calculation steps:
[( 81 - 454 ) ÷ 454] x 100 = -82.16%
Formula
Percentage change = [(81 - 454) / 454] x 100
Subtract the new number by the original number
81 - 454 = -373
-373 ÷ 454 = -0.8215859030837004
-0.8215859030837004 x 100 = -82.16%