-82.2% is the change from 455 to 81
Calculation steps:
[( 81 - 455 ) ÷ 455] x 100 = -82.2%
Formula
Percentage change = [(81 - 455) / 455] x 100
Subtract the new number by the original number
81 - 455 = -374
-374 ÷ 455 = -0.8219780219780219
-0.8219780219780219 x 100 = -82.2%