-39.96% is the change from 991 to 595
Calculation steps:
[( 595 - 991 ) ÷ 991] x 100 = -39.96%
Formula
Percentage change = [(595 - 991) / 991] x 100
Subtract the new number by the original number
595 - 991 = -396
-396 ÷ 991 = -0.39959636730575177
-0.39959636730575177 x 100 = -39.96%