-36.93% is the change from 639 to 403
Calculation steps:
[( 403 - 639 ) ÷ 639] x 100 = -36.93%
Formula
Percentage change = [(403 - 639) / 639] x 100
Subtract the new number by the original number
403 - 639 = -236
-236 ÷ 639 = -0.36932707355242567
-0.36932707355242567 x 100 = -36.93%