-69.82% is the change from 328 to 99
Calculation steps:
[( 99 - 328 ) ÷ 328] x 100 = -69.82%
Formula
Percentage change = [(99 - 328) / 328] x 100
Subtract the new number by the original number
99 - 328 = -229
-229 ÷ 328 = -0.698170731707317
-0.698170731707317 x 100 = -69.82%