-69.35% is the change from 323 to 99
Calculation steps:
[( 99 - 323 ) ÷ 323] x 100 = -69.35%
Formula
Percentage change = [(99 - 323) / 323] x 100
Subtract the new number by the original number
99 - 323 = -224
-224 ÷ 323 = -0.6934984520123839
-0.6934984520123839 x 100 = -69.35%