-40.77% is the change from 991 to 587
Calculation steps:
[( 587 - 991 ) ÷ 991] x 100 = -40.77%
Formula
Percentage change = [(587 - 991) / 991] x 100
Subtract the new number by the original number
587 - 991 = -404
-404 ÷ 991 = -0.40766902119071646
-0.40766902119071646 x 100 = -40.77%