-83.54% is the change from 990 to 163
Calculation steps:
[( 163 - 990 ) ÷ 990] x 100 = -83.54%
Formula
Percentage change = [(163 - 990) / 990] x 100
Subtract the new number by the original number
163 - 990 = -827
-827 ÷ 990 = -0.8353535353535354
-0.8353535353535354 x 100 = -83.54%