-87.79% is the change from 999 to 122
Calculation steps:
[( 122 - 999 ) ÷ 999] x 100 = -87.79%
Formula
Percentage change = [(122 - 999) / 999] x 100
Subtract the new number by the original number
122 - 999 = -877
-877 ÷ 999 = -0.8778778778778779
-0.8778778778778779 x 100 = -87.79%