-50% is the change from 658 to 329
Calculation steps:
[( 329 - 658 ) ÷ 658] x 100 = -50%
Formula
Percentage change = [(329 - 658) / 658] x 100
Subtract the new number by the original number
329 - 658 = -329
-329 ÷ 658 = -0.5
-0.5 x 100 = -50%
Example