-68.6% is the change from 551 to 173
Calculation steps:
[( 173 - 551 ) ÷ 551] x 100 = -68.6%
Formula
Percentage change = [(173 - 551) / 551] x 100
Subtract the new number by the original number
173 - 551 = -378
-378 ÷ 551 = -0.6860254083484574
-0.6860254083484574 x 100 = -68.6%