-39.66% is the change from 991 to 598
Calculation steps:
[( 598 - 991 ) ÷ 991] x 100 = -39.66%
Formula
Percentage change = [(598 - 991) / 991] x 100
Subtract the new number by the original number
598 - 991 = -393
-393 ÷ 991 = -0.39656912209889
-0.39656912209889 x 100 = -39.66%