-25.49% is the change from 859 to 640
Calculation steps:
[( 640 - 859 ) ÷ 859] x 100 = -25.49%
Formula
Percentage change = [(640 - 859) / 859] x 100
Subtract the new number by the original number
640 - 859 = -219
-219 ÷ 859 = -0.2549476135040745
-0.2549476135040745 x 100 = -25.49%