-23.33% is the change from 643 to 493
Calculation steps:
[( 493 - 643 ) ÷ 643] x 100 = -23.33%
Formula
Percentage change = [(493 - 643) / 643] x 100
Subtract the new number by the original number
493 - 643 = -150
-150 ÷ 643 = -0.2332814930015552
-0.2332814930015552 x 100 = -23.33%