-56.52% is the change from 391 to 170
Calculation steps:
[( 170 - 391 ) ÷ 391] x 100 = -56.52%
Formula
Percentage change = [(170 - 391) / 391] x 100
Subtract the new number by the original number
170 - 391 = -221
-221 ÷ 391 = -0.5652173913043478
-0.5652173913043478 x 100 = -56.52%