-12.61% is the change from 991 to 866
Calculation steps:
[( 866 - 991 ) ÷ 991] x 100 = -12.61%
Formula
Percentage change = [(866 - 991) / 991] x 100
Subtract the new number by the original number
866 - 991 = -125
-125 ÷ 991 = -0.12613521695257315
-0.12613521695257315 x 100 = -12.61%