-89.79% is the change from 813 to 83
Calculation steps:
[( 83 - 813 ) ÷ 813] x 100 = -89.79%
Formula
Percentage change = [(83 - 813) / 813] x 100
Subtract the new number by the original number
83 - 813 = -730
-730 ÷ 813 = -0.897908979089791
-0.897908979089791 x 100 = -89.79%