-87.68% is the change from 990 to 122
Calculation steps:
[( 122 - 990 ) ÷ 990] x 100 = -87.68%
Formula
Percentage change = [(122 - 990) / 990] x 100
Subtract the new number by the original number
122 - 990 = -868
-868 ÷ 990 = -0.8767676767676768
-0.8767676767676768 x 100 = -87.68%