-50.3% is the change from 831 to 413
Calculation steps:
[( 413 - 831 ) ÷ 831] x 100 = -50.3%
Formula
Percentage change = [(413 - 831) / 831] x 100
Subtract the new number by the original number
413 - 831 = -418
-418 ÷ 831 = -0.5030084235860409
-0.5030084235860409 x 100 = -50.3%