-40.64% is the change from 999 to 593
Calculation steps:
[( 593 - 999 ) ÷ 999] x 100 = -40.64%
Formula
Percentage change = [(593 - 999) / 999] x 100
Subtract the new number by the original number
593 - 999 = -406
-406 ÷ 999 = -0.4064064064064064
-0.4064064064064064 x 100 = -40.64%