-39.86% is the change from 991 to 596
Calculation steps:
[( 596 - 991 ) ÷ 991] x 100 = -39.86%
Formula
Percentage change = [(596 - 991) / 991] x 100
Subtract the new number by the original number
596 - 991 = -395
-395 ÷ 991 = -0.3985872855701312
-0.3985872855701312 x 100 = -39.86%