-40.97% is the change from 991 to 585
Calculation steps:
[( 585 - 991 ) ÷ 991] x 100 = -40.97%
Formula
Percentage change = [(585 - 991) / 991] x 100
Subtract the new number by the original number
585 - 991 = -406
-406 ÷ 991 = -0.40968718466195764
-0.40968718466195764 x 100 = -40.97%