-39.8% is the change from 990 to 596
Calculation steps:
[( 596 - 990 ) ÷ 990] x 100 = -39.8%
Formula
Percentage change = [(596 - 990) / 990] x 100
Subtract the new number by the original number
596 - 990 = -394
-394 ÷ 990 = -0.397979797979798
-0.397979797979798 x 100 = -39.8%