-48.99% is the change from 643 to 328
Calculation steps:
[( 328 - 643 ) ÷ 643] x 100 = -48.99%
Formula
Percentage change = [(328 - 643) / 643] x 100
Subtract the new number by the original number
328 - 643 = -315
-315 ÷ 643 = -0.48989113530326595
-0.48989113530326595 x 100 = -48.99%