-22.55% is the change from 825 to 639
Calculation steps:
[( 639 - 825 ) ÷ 825] x 100 = -22.55%
Formula
Percentage change = [(639 - 825) / 825] x 100
Subtract the new number by the original number
639 - 825 = -186
-186 ÷ 825 = -0.22545454545454546
-0.22545454545454546 x 100 = -22.55%