-49.92% is the change from 643 to 322
Calculation steps:
[( 322 - 643 ) ÷ 643] x 100 = -49.92%
Formula
Percentage change = [(322 - 643) / 643] x 100
Subtract the new number by the original number
322 - 643 = -321
-321 ÷ 643 = -0.49922239502332816
-0.49922239502332816 x 100 = -49.92%