-56.49% is the change from 393 to 171
Calculation steps:
[( 171 - 393 ) ÷ 393] x 100 = -56.49%
Formula
Percentage change = [(171 - 393) / 393] x 100
Subtract the new number by the original number
171 - 393 = -222
-222 ÷ 393 = -0.5648854961832062
-0.5648854961832062 x 100 = -56.49%