-77.24% is the change from 435 to 99
Calculation steps:
[( 99 - 435 ) ÷ 435] x 100 = -77.24%
Formula
Percentage change = [(99 - 435) / 435] x 100
Subtract the new number by the original number
99 - 435 = -336
-336 ÷ 435 = -0.7724137931034483
-0.7724137931034483 x 100 = -77.24%