-99.22% is the change from 639 to 5
Calculation steps:
[( 5 - 639 ) ÷ 639] x 100 = -99.22%
Formula
Percentage change = [(5 - 639) / 639] x 100
Subtract the new number by the original number
5 - 639 = -634
-634 ÷ 639 = -0.9921752738654147
-0.9921752738654147 x 100 = -99.22%