-77.08% is the change from 397 to 91
Calculation steps:
[( 91 - 397 ) ÷ 397] x 100 = -77.08%
Formula
Percentage change = [(91 - 397) / 397] x 100
Subtract the new number by the original number
91 - 397 = -306
-306 ÷ 397 = -0.7707808564231738
-0.7707808564231738 x 100 = -77.08%