-29.04% is the change from 551 to 391
Calculation steps:
[( 391 - 551 ) ÷ 551] x 100 = -29.04%
Formula
Percentage change = [(391 - 551) / 551] x 100
Subtract the new number by the original number
391 - 551 = -160
-160 ÷ 551 = -0.29038112522686027
-0.29038112522686027 x 100 = -29.04%