-26.47% is the change from 869 to 639
Calculation steps:
[( 639 - 869 ) ÷ 869] x 100 = -26.47%
Formula
Percentage change = [(639 - 869) / 869] x 100
Subtract the new number by the original number
639 - 869 = -230
-230 ÷ 869 = -0.2646720368239356
-0.2646720368239356 x 100 = -26.47%