-57.03% is the change from 910 to 391
Calculation steps:
[( 391 - 910 ) ÷ 910] x 100 = -57.03%
Formula
Percentage change = [(391 - 910) / 910] x 100
Subtract the new number by the original number
391 - 910 = -519
-519 ÷ 910 = -0.5703296703296703
-0.5703296703296703 x 100 = -57.03%