-22.43% is the change from 321 to 249
Calculation steps:
[( 249 - 321 ) ÷ 321] x 100 = -22.43%
Formula
Percentage change = [(249 - 321) / 321] x 100
Subtract the new number by the original number
249 - 321 = -72
-72 ÷ 321 = -0.22429906542056074
-0.22429906542056074 x 100 = -22.43%