-98.28% is the change from 638 to 11
Calculation steps:
[( 11 - 638 ) ÷ 638] x 100 = -98.28%
Formula
Percentage change = [(11 - 638) / 638] x 100
Subtract the new number by the original number
11 - 638 = -627
-627 ÷ 638 = -0.9827586206896551
-0.9827586206896551 x 100 = -98.28%