-69.87% is the change from 551 to 166
Calculation steps:
[( 166 - 551 ) ÷ 551] x 100 = -69.87%
Formula
Percentage change = [(166 - 551) / 551] x 100
Subtract the new number by the original number
166 - 551 = -385
-385 ÷ 551 = -0.6987295825771325
-0.6987295825771325 x 100 = -69.87%