-83.44% is the change from 489 to 81
Calculation steps:
[( 81 - 489 ) ÷ 489] x 100 = -83.44%
Formula
Percentage change = [(81 - 489) / 489] x 100
Subtract the new number by the original number
81 - 489 = -408
-408 ÷ 489 = -0.8343558282208589
-0.8343558282208589 x 100 = -83.44%