-83.1% is the change from 491 to 83
Calculation steps:
[( 83 - 491 ) ÷ 491] x 100 = -83.1%
Formula
Percentage change = [(83 - 491) / 491] x 100
Subtract the new number by the original number
83 - 491 = -408
-408 ÷ 491 = -0.8309572301425662
-0.8309572301425662 x 100 = -83.1%