-40% is the change from 990 to 594
Calculation steps:
[( 594 - 990 ) ÷ 990] x 100 = -40%
Formula
Percentage change = [(594 - 990) / 990] x 100
Subtract the new number by the original number
594 - 990 = -396
-396 ÷ 990 = -0.4
-0.4 x 100 = -40%
Example