-78.38% is the change from 643 to 139
Calculation steps:
[( 139 - 643 ) ÷ 643] x 100 = -78.38%
Formula
Percentage change = [(139 - 643) / 643] x 100
Subtract the new number by the original number
139 - 643 = -504
-504 ÷ 643 = -0.7838258164852255
-0.7838258164852255 x 100 = -78.38%