-39.84% is the change from 861 to 518
Calculation steps:
[( 518 - 861 ) ÷ 861] x 100 = -39.84%
Formula
Percentage change = [(518 - 861) / 861] x 100
Subtract the new number by the original number
518 - 861 = -343
-343 ÷ 861 = -0.3983739837398374
-0.3983739837398374 x 100 = -39.84%