-25.84% is the change from 863 to 640
Calculation steps:
[( 640 - 863 ) ÷ 863] x 100 = -25.84%
Formula
Percentage change = [(640 - 863) / 863] x 100
Subtract the new number by the original number
640 - 863 = -223
-223 ÷ 863 = -0.25840092699884126
-0.25840092699884126 x 100 = -25.84%