-70.93% is the change from 313 to 91
Calculation steps:
[( 91 - 313 ) ÷ 313] x 100 = -70.93%
Formula
Percentage change = [(91 - 313) / 313] x 100
Subtract the new number by the original number
91 - 313 = -222
-222 ÷ 313 = -0.7092651757188498
-0.7092651757188498 x 100 = -70.93%