-40.94% is the change from 999 to 590
Calculation steps:
[( 590 - 999 ) ÷ 999] x 100 = -40.94%
Formula
Percentage change = [(590 - 999) / 999] x 100
Subtract the new number by the original number
590 - 999 = -409
-409 ÷ 999 = -0.4094094094094094
-0.4094094094094094 x 100 = -40.94%