-83.49% is the change from 321 to 53
Calculation steps:
[( 53 - 321 ) ÷ 321] x 100 = -83.49%
Formula
Percentage change = [(53 - 321) / 321] x 100
Subtract the new number by the original number
53 - 321 = -268
-268 ÷ 321 = -0.8348909657320872
-0.8348909657320872 x 100 = -83.49%