-83.36% is the change from 643 to 107
Calculation steps:
[( 107 - 643 ) ÷ 643] x 100 = -83.36%
Formula
Percentage change = [(107 - 643) / 643] x 100
Subtract the new number by the original number
107 - 643 = -536
-536 ÷ 643 = -0.833592534992224
-0.833592534992224 x 100 = -83.36%