-5.34% is the change from 581 to 550
Calculation steps:
[( 550 - 581 ) ÷ 581] x 100 = -5.34%
Formula
Percentage change = [(550 - 581) / 581] x 100
Subtract the new number by the original number
550 - 581 = -31
-31 ÷ 581 = -0.05335628227194492
-0.05335628227194492 x 100 = -5.34%