-97.51% is the change from 642 to 16
Calculation steps:
[( 16 - 642 ) ÷ 642] x 100 = -97.51%
Formula
Percentage change = [(16 - 642) / 642] x 100
Subtract the new number by the original number
16 - 642 = -626
-626 ÷ 642 = -0.9750778816199377
-0.9750778816199377 x 100 = -97.51%