-98.76% is the change from 643 to 8
Calculation steps:
[( 8 - 643 ) ÷ 643] x 100 = -98.76%
Formula
Percentage change = [(8 - 643) / 643] x 100
Subtract the new number by the original number
8 - 643 = -635
-635 ÷ 643 = -0.9875583203732504
-0.9875583203732504 x 100 = -98.76%