-99.22% is the change from 638 to 5
Calculation steps:
[( 5 - 638 ) ÷ 638] x 100 = -99.22%
Formula
Percentage change = [(5 - 638) / 638] x 100
Subtract the new number by the original number
5 - 638 = -633
-633 ÷ 638 = -0.9921630094043887
-0.9921630094043887 x 100 = -99.22%