-59.09% is the change from 831 to 340
Calculation steps:
[( 340 - 831 ) ÷ 831] x 100 = -59.09%
Formula
Percentage change = [(340 - 831) / 831] x 100
Subtract the new number by the original number
340 - 831 = -491
-491 ÷ 831 = -0.5908543922984356
-0.5908543922984356 x 100 = -59.09%