-49.23% is the change from 646 to 328
Calculation steps:
[( 328 - 646 ) ÷ 646] x 100 = -49.23%
Formula
Percentage change = [(328 - 646) / 646] x 100
Subtract the new number by the original number
328 - 646 = -318
-318 ÷ 646 = -0.49226006191950467
-0.49226006191950467 x 100 = -49.23%