-96.27% is the change from 643 to 24
Calculation steps:
[( 24 - 643 ) ÷ 643] x 100 = -96.27%
Formula
Percentage change = [(24 - 643) / 643] x 100
Subtract the new number by the original number
24 - 643 = -619
-619 ÷ 643 = -0.9626749611197511
-0.9626749611197511 x 100 = -96.27%