-0.51% is the change from 391 to 389
Calculation steps:
[( 389 - 391 ) ÷ 391] x 100 = -0.51%
Formula
Percentage change = [(389 - 391) / 391] x 100
Subtract the new number by the original number
389 - 391 = -2
-2 ÷ 391 = -0.005115089514066497
-0.005115089514066497 x 100 = -0.51%