-56.03% is the change from 639 to 281
Calculation steps:
[( 281 - 639 ) ÷ 639] x 100 = -56.03%
Formula
Percentage change = [(281 - 639) / 639] x 100
Subtract the new number by the original number
281 - 639 = -358
-358 ÷ 639 = -0.5602503912363067
-0.5602503912363067 x 100 = -56.03%