-47.28% is the change from 643 to 339
Calculation steps:
[( 339 - 643 ) ÷ 643] x 100 = -47.28%
Formula
Percentage change = [(339 - 643) / 643] x 100
Subtract the new number by the original number
339 - 643 = -304
-304 ÷ 643 = -0.4727838258164852
-0.4727838258164852 x 100 = -47.28%