-26.3% is the change from 867 to 639
Calculation steps:
[( 639 - 867 ) ÷ 867] x 100 = -26.3%
Formula
Percentage change = [(639 - 867) / 867] x 100
Subtract the new number by the original number
639 - 867 = -228
-228 ÷ 867 = -0.2629757785467128
-0.2629757785467128 x 100 = -26.3%