-97.28% is the change from 551 to 15
Calculation steps:
[( 15 - 551 ) ÷ 551] x 100 = -97.28%
Formula
Percentage change = [(15 - 551) / 551] x 100
Subtract the new number by the original number
15 - 551 = -536
-536 ÷ 551 = -0.9727767695099818
-0.9727767695099818 x 100 = -97.28%