-80.96% is the change from 478 to 91
Calculation steps:
[( 91 - 478 ) ÷ 478] x 100 = -80.96%
Formula
Percentage change = [(91 - 478) / 478] x 100
Subtract the new number by the original number
91 - 478 = -387
-387 ÷ 478 = -0.8096234309623431
-0.8096234309623431 x 100 = -80.96%