-79.94% is the change from 643 to 129
Calculation steps:
[( 129 - 643 ) ÷ 643] x 100 = -79.94%
Formula
Percentage change = [(129 - 643) / 643] x 100
Subtract the new number by the original number
129 - 643 = -514
-514 ÷ 643 = -0.7993779160186625
-0.7993779160186625 x 100 = -79.94%