-41.37% is the change from 991 to 581
Calculation steps:
[( 581 - 991 ) ÷ 991] x 100 = -41.37%
Formula
Percentage change = [(581 - 991) / 991] x 100
Subtract the new number by the original number
581 - 991 = -410
-410 ÷ 991 = -0.41372351160444
-0.41372351160444 x 100 = -41.37%