-18.15% is the change from 551 to 451
Calculation steps:
[( 451 - 551 ) ÷ 551] x 100 = -18.15%
Formula
Percentage change = [(451 - 551) / 551] x 100
Subtract the new number by the original number
451 - 551 = -100
-100 ÷ 551 = -0.18148820326678766
-0.18148820326678766 x 100 = -18.15%