-39.19% is the change from 990 to 602
Calculation steps:
[( 602 - 990 ) ÷ 990] x 100 = -39.19%
Formula
Percentage change = [(602 - 990) / 990] x 100
Subtract the new number by the original number
602 - 990 = -388
-388 ÷ 990 = -0.39191919191919194
-0.39191919191919194 x 100 = -39.19%