-15.49% is the change from 581 to 491
Calculation steps:
[( 491 - 581 ) ÷ 581] x 100 = -15.49%
Formula
Percentage change = [(491 - 581) / 581] x 100
Subtract the new number by the original number
491 - 581 = -90
-90 ÷ 581 = -0.1549053356282272
-0.1549053356282272 x 100 = -15.49%