-99.04% is the change from 830 to 8
Calculation steps:
[( 8 - 830 ) ÷ 830] x 100 = -99.04%
Formula
Percentage change = [(8 - 830) / 830] x 100
Subtract the new number by the original number
8 - 830 = -822
-822 ÷ 830 = -0.9903614457831326
-0.9903614457831326 x 100 = -99.04%