-49.07% is the change from 646 to 329
Calculation steps:
[( 329 - 646 ) ÷ 646] x 100 = -49.07%
Formula
Percentage change = [(329 - 646) / 646] x 100
Subtract the new number by the original number
329 - 646 = -317
-317 ÷ 646 = -0.4907120743034056
-0.4907120743034056 x 100 = -49.07%