-0.9% is the change from 556 to 551
Calculation steps:
[( 551 - 556 ) ÷ 556] x 100 = -0.9%
Formula
Percentage change = [(551 - 556) / 556] x 100
Subtract the new number by the original number
551 - 556 = -5
-5 ÷ 556 = -0.008992805755395683
-0.008992805755395683 x 100 = -0.9%