-28.04% is the change from 888 to 639
Calculation steps:
[( 639 - 888 ) ÷ 888] x 100 = -28.04%
Formula
Percentage change = [(639 - 888) / 888] x 100
Subtract the new number by the original number
639 - 888 = -249
-249 ÷ 888 = -0.28040540540540543
-0.28040540540540543 x 100 = -28.04%