-99.74% is the change from 391 to 1
Calculation steps:
[( 1 - 391 ) ÷ 391] x 100 = -99.74%
Formula
Percentage change = [(1 - 391) / 391] x 100
Subtract the new number by the original number
1 - 391 = -390
-390 ÷ 391 = -0.9974424552429667
-0.9974424552429667 x 100 = -99.74%