-50.67% is the change from 667 to 329
Calculation steps:
[( 329 - 667 ) ÷ 667] x 100 = -50.67%
Formula
Percentage change = [(329 - 667) / 667] x 100
Subtract the new number by the original number
329 - 667 = -338
-338 ÷ 667 = -0.5067466266866567
-0.5067466266866567 x 100 = -50.67%