-74.49% is the change from 643 to 164
Calculation steps:
[( 164 - 643 ) ÷ 643] x 100 = -74.49%
Formula
Percentage change = [(164 - 643) / 643] x 100
Subtract the new number by the original number
164 - 643 = -479
-479 ÷ 643 = -0.744945567651633
-0.744945567651633 x 100 = -74.49%