-71.47% is the change from 319 to 91
Calculation steps:
[( 91 - 319 ) ÷ 319] x 100 = -71.47%
Formula
Percentage change = [(91 - 319) / 319] x 100
Subtract the new number by the original number
91 - 319 = -228
-228 ÷ 319 = -0.7147335423197492
-0.7147335423197492 x 100 = -71.47%