-26.13% is the change from 865 to 639
Calculation steps:
[( 639 - 865 ) ÷ 865] x 100 = -26.13%
Formula
Percentage change = [(639 - 865) / 865] x 100
Subtract the new number by the original number
639 - 865 = -226
-226 ÷ 865 = -0.261271676300578
-0.261271676300578 x 100 = -26.13%