-19.44% is the change from 643 to 518
Calculation steps:
[( 518 - 643 ) ÷ 643] x 100 = -19.44%
Formula
Percentage change = [(518 - 643) / 643] x 100
Subtract the new number by the original number
518 - 643 = -125
-125 ÷ 643 = -0.19440124416796267
-0.19440124416796267 x 100 = -19.44%