-91.92% is the change from 99 to 8
Calculation steps:
[( 8 - 99 ) ÷ 99] x 100 = -91.92%
Formula
Percentage change = [(8 - 99) / 99] x 100
Subtract the new number by the original number
8 - 99 = -91
-91 ÷ 99 = -0.9191919191919192
-0.9191919191919192 x 100 = -91.92%