-93.62% is the change from 329 to 21
Calculation steps:
[( 21 - 329 ) ÷ 329] x 100 = -93.62%
Formula
Percentage change = [(21 - 329) / 329] x 100
Subtract the new number by the original number
21 - 329 = -308
-308 ÷ 329 = -0.9361702127659575
-0.9361702127659575 x 100 = -93.62%