-48.83% is the change from 639 to 327
Calculation steps:
[( 327 - 639 ) ÷ 639] x 100 = -48.83%
Formula
Percentage change = [(327 - 639) / 639] x 100
Subtract the new number by the original number
327 - 639 = -312
-312 ÷ 639 = -0.48826291079812206
-0.48826291079812206 x 100 = -48.83%