-23.35% is the change from 638 to 489
Calculation steps:
[( 489 - 638 ) ÷ 638] x 100 = -23.35%
Formula
Percentage change = [(489 - 638) / 638] x 100
Subtract the new number by the original number
489 - 638 = -149
-149 ÷ 638 = -0.2335423197492163
-0.2335423197492163 x 100 = -23.35%