-68.97% is the change from 551 to 171
Calculation steps:
[( 171 - 551 ) ÷ 551] x 100 = -68.97%
Formula
Percentage change = [(171 - 551) / 551] x 100
Subtract the new number by the original number
171 - 551 = -380
-380 ÷ 551 = -0.6896551724137931
-0.6896551724137931 x 100 = -68.97%