-56.01% is the change from 391 to 172
Calculation steps:
[( 172 - 391 ) ÷ 391] x 100 = -56.01%
Formula
Percentage change = [(172 - 391) / 391] x 100
Subtract the new number by the original number
172 - 391 = -219
-219 ÷ 391 = -0.5601023017902813
-0.5601023017902813 x 100 = -56.01%