-57.79% is the change from 931 to 393
Calculation steps:
[( 393 - 931 ) ÷ 931] x 100 = -57.79%
Formula
Percentage change = [(393 - 931) / 931] x 100
Subtract the new number by the original number
393 - 931 = -538
-538 ÷ 931 = -0.5778732545649838
-0.5778732545649838 x 100 = -57.79%