-50.07% is the change from 677 to 338
Calculation steps:
[( 338 - 677 ) ÷ 677] x 100 = -50.07%
Formula
Percentage change = [(338 - 677) / 677] x 100
Subtract the new number by the original number
338 - 677 = -339
-339 ÷ 677 = -0.5007385524372231
-0.5007385524372231 x 100 = -50.07%