-82.24% is the change from 456 to 81
Calculation steps:
[( 81 - 456 ) ÷ 456] x 100 = -82.24%
Formula
Percentage change = [(81 - 456) / 456] x 100
Subtract the new number by the original number
81 - 456 = -375
-375 ÷ 456 = -0.8223684210526315
-0.8223684210526315 x 100 = -82.24%