-56.27% is the change from 391 to 171
Calculation steps:
[( 171 - 391 ) ÷ 391] x 100 = -56.27%
Formula
Percentage change = [(171 - 391) / 391] x 100
Subtract the new number by the original number
171 - 391 = -220
-220 ÷ 391 = -0.5626598465473146
-0.5626598465473146 x 100 = -56.27%