-12.53% is the change from 990 to 866
Calculation steps:
[( 866 - 990 ) ÷ 990] x 100 = -12.53%
Formula
Percentage change = [(866 - 990) / 990] x 100
Subtract the new number by the original number
866 - 990 = -124
-124 ÷ 990 = -0.12525252525252525
-0.12525252525252525 x 100 = -12.53%