-95.61% is the change from 638 to 28
Calculation steps:
[( 28 - 638 ) ÷ 638] x 100 = -95.61%
Formula
Percentage change = [(28 - 638) / 638] x 100
Subtract the new number by the original number
28 - 638 = -610
-610 ÷ 638 = -0.9561128526645768
-0.9561128526645768 x 100 = -95.61%