-83.83% is the change from 643 to 104
Calculation steps:
[( 104 - 643 ) ÷ 643] x 100 = -83.83%
Formula
Percentage change = [(104 - 643) / 643] x 100
Subtract the new number by the original number
104 - 643 = -539
-539 ÷ 643 = -0.838258164852255
-0.838258164852255 x 100 = -83.83%