-91.54% is the change from 638 to 54
Calculation steps:
[( 54 - 638 ) ÷ 638] x 100 = -91.54%
Formula
Percentage change = [(54 - 638) / 638] x 100
Subtract the new number by the original number
54 - 638 = -584
-584 ÷ 638 = -0.9153605015673981
-0.9153605015673981 x 100 = -91.54%