-54.05% is the change from 851 to 391
Calculation steps:
[( 391 - 851 ) ÷ 851] x 100 = -54.05%
Formula
Percentage change = [(391 - 851) / 851] x 100
Subtract the new number by the original number
391 - 851 = -460
-460 ÷ 851 = -0.5405405405405406
-0.5405405405405406 x 100 = -54.05%