-89.77% is the change from 811 to 83
Calculation steps:
[( 83 - 811 ) ÷ 811] x 100 = -89.77%
Formula
Percentage change = [(83 - 811) / 811] x 100
Subtract the new number by the original number
83 - 811 = -728
-728 ÷ 811 = -0.8976572133168927
-0.8976572133168927 x 100 = -89.77%