-31.97% is the change from 391 to 266
Calculation steps:
[( 266 - 391 ) ÷ 391] x 100 = -31.97%
Formula
Percentage change = [(266 - 391) / 391] x 100
Subtract the new number by the original number
266 - 391 = -125
-125 ÷ 391 = -0.319693094629156
-0.319693094629156 x 100 = -31.97%