-96.73% is the change from 551 to 18
Calculation steps:
[( 18 - 551 ) ÷ 551] x 100 = -96.73%
Formula
Percentage change = [(18 - 551) / 551] x 100
Subtract the new number by the original number
18 - 551 = -533
-533 ÷ 551 = -0.9673321234119783
-0.9673321234119783 x 100 = -96.73%