-50.97% is the change from 671 to 329
Calculation steps:
[( 329 - 671 ) ÷ 671] x 100 = -50.97%
Formula
Percentage change = [(329 - 671) / 671] x 100
Subtract the new number by the original number
329 - 671 = -342
-342 ÷ 671 = -0.5096870342771982
-0.5096870342771982 x 100 = -50.97%