-49.14% is the change from 639 to 325
Calculation steps:
[( 325 - 639 ) ÷ 639] x 100 = -49.14%
Formula
Percentage change = [(325 - 639) / 639] x 100
Subtract the new number by the original number
325 - 639 = -314
-314 ÷ 639 = -0.49139280125195617
-0.49139280125195617 x 100 = -49.14%