-98.75% is the change from 641 to 8
Calculation steps:
[( 8 - 641 ) ÷ 641] x 100 = -98.75%
Formula
Percentage change = [(8 - 641) / 641] x 100
Subtract the new number by the original number
8 - 641 = -633
-633 ÷ 641 = -0.9875195007800313
-0.9875195007800313 x 100 = -98.75%