-39.15% is the change from 991 to 603
Calculation steps:
[( 603 - 991 ) ÷ 991] x 100 = -39.15%
Formula
Percentage change = [(603 - 991) / 991] x 100
Subtract the new number by the original number
603 - 991 = -388
-388 ÷ 991 = -0.39152371342078707
-0.39152371342078707 x 100 = -39.15%