-2.95% is the change from 643 to 624
Calculation steps:
[( 624 - 643 ) ÷ 643] x 100 = -2.95%
Formula
Percentage change = [(624 - 643) / 643] x 100
Subtract the new number by the original number
624 - 643 = -19
-19 ÷ 643 = -0.029548989113530325
-0.029548989113530325 x 100 = -2.95%