-83.67% is the change from 643 to 105
Calculation steps:
[( 105 - 643 ) ÷ 643] x 100 = -83.67%
Formula
Percentage change = [(105 - 643) / 643] x 100
Subtract the new number by the original number
105 - 643 = -538
-538 ÷ 643 = -0.8367029548989113
-0.8367029548989113 x 100 = -83.67%