-35.81% is the change from 391 to 251
Calculation steps:
[( 251 - 391 ) ÷ 391] x 100 = -35.81%
Formula
Percentage change = [(251 - 391) / 391] x 100
Subtract the new number by the original number
251 - 391 = -140
-140 ÷ 391 = -0.35805626598465473
-0.35805626598465473 x 100 = -35.81%