-22.29% is the change from 323 to 251
Calculation steps:
[( 251 - 323 ) ÷ 323] x 100 = -22.29%
Formula
Percentage change = [(251 - 323) / 323] x 100
Subtract the new number by the original number
251 - 323 = -72
-72 ÷ 323 = -0.22291021671826625
-0.22291021671826625 x 100 = -22.29%