-83.74% is the change from 990 to 161
Calculation steps:
[( 161 - 990 ) ÷ 990] x 100 = -83.74%
Formula
Percentage change = [(161 - 990) / 990] x 100
Subtract the new number by the original number
161 - 990 = -829
-829 ÷ 990 = -0.8373737373737373
-0.8373737373737373 x 100 = -83.74%