-57.32% is the change from 991 to 423
Calculation steps:
[( 423 - 991 ) ÷ 991] x 100 = -57.32%
Formula
Percentage change = [(423 - 991) / 991] x 100
Subtract the new number by the original number
423 - 991 = -568
-568 ÷ 991 = -0.5731584258324924
-0.5731584258324924 x 100 = -57.32%