-57.17% is the change from 913 to 391
Calculation steps:
[( 391 - 913 ) ÷ 913] x 100 = -57.17%
Formula
Percentage change = [(391 - 913) / 913] x 100
Subtract the new number by the original number
391 - 913 = -522
-522 ÷ 913 = -0.5717415115005476
-0.5717415115005476 x 100 = -57.17%