-77.75% is the change from 409 to 91
Calculation steps:
[( 91 - 409 ) ÷ 409] x 100 = -77.75%
Formula
Percentage change = [(91 - 409) / 409] x 100
Subtract the new number by the original number
91 - 409 = -318
-318 ÷ 409 = -0.7775061124694377
-0.7775061124694377 x 100 = -77.75%