-80.4% is the change from 643 to 126
Calculation steps:
[( 126 - 643 ) ÷ 643] x 100 = -80.4%
Formula
Percentage change = [(126 - 643) / 643] x 100
Subtract the new number by the original number
126 - 643 = -517
-517 ÷ 643 = -0.8040435458786936
-0.8040435458786936 x 100 = -80.4%