-57.36% is the change from 917 to 391
Calculation steps:
[( 391 - 917 ) ÷ 917] x 100 = -57.36%
Formula
Percentage change = [(391 - 917) / 917] x 100
Subtract the new number by the original number
391 - 917 = -526
-526 ÷ 917 = -0.5736095965103599
-0.5736095965103599 x 100 = -57.36%