-2.33% is the change from 643 to 628
Calculation steps:
[( 628 - 643 ) ÷ 643] x 100 = -2.33%
Formula
Percentage change = [(628 - 643) / 643] x 100
Subtract the new number by the original number
628 - 643 = -15
-15 ÷ 643 = -0.02332814930015552
-0.02332814930015552 x 100 = -2.33%