-89.83% is the change from 816 to 83
Calculation steps:
[( 83 - 816 ) ÷ 816] x 100 = -89.83%
Formula
Percentage change = [(83 - 816) / 816] x 100
Subtract the new number by the original number
83 - 816 = -733
-733 ÷ 816 = -0.8982843137254902
-0.8982843137254902 x 100 = -89.83%