-49.15% is the change from 647 to 329
Calculation steps:
[( 329 - 647 ) ÷ 647] x 100 = -49.15%
Formula
Percentage change = [(329 - 647) / 647] x 100
Subtract the new number by the original number
329 - 647 = -318
-318 ÷ 647 = -0.49149922720247297
-0.49149922720247297 x 100 = -49.15%