-85.07% is the change from 643 to 96
Calculation steps:
[( 96 - 643 ) ÷ 643] x 100 = -85.07%
Formula
Percentage change = [(96 - 643) / 643] x 100
Subtract the new number by the original number
96 - 643 = -547
-547 ÷ 643 = -0.8506998444790047
-0.8506998444790047 x 100 = -85.07%