-0.35% is the change from 869 to 866
Calculation steps:
[( 866 - 869 ) ÷ 869] x 100 = -0.35%
Formula
Percentage change = [(866 - 869) / 869] x 100
Subtract the new number by the original number
866 - 869 = -3
-3 ÷ 869 = -0.0034522439585730723
-0.0034522439585730723 x 100 = -0.35%