-2% is the change from 551 to 540
Calculation steps:
[( 540 - 551 ) ÷ 551] x 100 = -2%
Formula
Percentage change = [(540 - 551) / 551] x 100
Subtract the new number by the original number
540 - 551 = -11
-11 ÷ 551 = -0.019963702359346643
-0.019963702359346643 x 100 = -2%