-82.28% is the change from 457 to 81
Calculation steps:
[( 81 - 457 ) ÷ 457] x 100 = -82.28%
Formula
Percentage change = [(81 - 457) / 457] x 100
Subtract the new number by the original number
81 - 457 = -376
-376 ÷ 457 = -0.8227571115973742
-0.8227571115973742 x 100 = -82.28%