-82.12% is the change from 453 to 81
Calculation steps:
[( 81 - 453 ) ÷ 453] x 100 = -82.12%
Formula
Percentage change = [(81 - 453) / 453] x 100
Subtract the new number by the original number
81 - 453 = -372
-372 ÷ 453 = -0.8211920529801324
-0.8211920529801324 x 100 = -82.12%