-97.49% is the change from 638 to 16
Calculation steps:
[( 16 - 638 ) ÷ 638] x 100 = -97.49%
Formula
Percentage change = [(16 - 638) / 638] x 100
Subtract the new number by the original number
16 - 638 = -622
-622 ÷ 638 = -0.9749216300940439
-0.9749216300940439 x 100 = -97.49%