-55.24% is the change from 639 to 286
Calculation steps:
[( 286 - 639 ) ÷ 639] x 100 = -55.24%
Formula
Percentage change = [(286 - 639) / 639] x 100
Subtract the new number by the original number
286 - 639 = -353
-353 ÷ 639 = -0.5524256651017214
-0.5524256651017214 x 100 = -55.24%