-83.77% is the change from 499 to 81
Calculation steps:
[( 81 - 499 ) ÷ 499] x 100 = -83.77%
Formula
Percentage change = [(81 - 499) / 499] x 100
Subtract the new number by the original number
81 - 499 = -418
-418 ÷ 499 = -0.8376753507014028
-0.8376753507014028 x 100 = -83.77%