-77.64% is the change from 407 to 91
Calculation steps:
[( 91 - 407 ) ÷ 407] x 100 = -77.64%
Formula
Percentage change = [(91 - 407) / 407] x 100
Subtract the new number by the original number
91 - 407 = -316
-316 ÷ 407 = -0.7764127764127764
-0.7764127764127764 x 100 = -77.64%