-26.58% is the change from 869 to 638
Calculation steps:
[( 638 - 869 ) ÷ 869] x 100 = -26.58%
Formula
Percentage change = [(638 - 869) / 869] x 100
Subtract the new number by the original number
638 - 869 = -231
-231 ÷ 869 = -0.26582278481012656
-0.26582278481012656 x 100 = -26.58%