-78.84% is the change from 430 to 91
Calculation steps:
[( 91 - 430 ) ÷ 430] x 100 = -78.84%
Formula
Percentage change = [(91 - 430) / 430] x 100
Subtract the new number by the original number
91 - 430 = -339
-339 ÷ 430 = -0.7883720930232558
-0.7883720930232558 x 100 = -78.84%