-50.38% is the change from 663 to 329
Calculation steps:
[( 329 - 663 ) ÷ 663] x 100 = -50.38%
Formula
Percentage change = [(329 - 663) / 663] x 100
Subtract the new number by the original number
329 - 663 = -334
-334 ÷ 663 = -0.5037707390648567
-0.5037707390648567 x 100 = -50.38%