-5.16% is the change from 581 to 551
Calculation steps:
[( 551 - 581 ) ÷ 581] x 100 = -5.16%
Formula
Percentage change = [(551 - 581) / 581] x 100
Subtract the new number by the original number
551 - 581 = -30
-30 ÷ 581 = -0.05163511187607573
-0.05163511187607573 x 100 = -5.16%