-40.87% is the change from 991 to 586
Calculation steps:
[( 586 - 991 ) ÷ 991] x 100 = -40.87%
Formula
Percentage change = [(586 - 991) / 991] x 100
Subtract the new number by the original number
586 - 991 = -405
-405 ÷ 991 = -0.40867810292633705
-0.40867810292633705 x 100 = -40.87%