-50.65% is the change from 999 to 493
Calculation steps:
[( 493 - 999 ) ÷ 999] x 100 = -50.65%
Formula
Percentage change = [(493 - 999) / 999] x 100
Subtract the new number by the original number
493 - 999 = -506
-506 ÷ 999 = -0.5065065065065065
-0.5065065065065065 x 100 = -50.65%