-7.77% is the change from 939 to 866
Calculation steps:
[( 866 - 939 ) ÷ 939] x 100 = -7.77%
Formula
Percentage change = [(866 - 939) / 939] x 100
Subtract the new number by the original number
866 - 939 = -73
-73 ÷ 939 = -0.0777422790202343
-0.0777422790202343 x 100 = -7.77%