-0.26% is the change from 391 to 390
Calculation steps:
[( 390 - 391 ) ÷ 391] x 100 = -0.26%
Formula
Percentage change = [(390 - 391) / 391] x 100
Subtract the new number by the original number
390 - 391 = -1
-1 ÷ 391 = -0.0025575447570332483
-0.0025575447570332483 x 100 = -0.26%