-0.62% is the change from 323 to 321
Calculation steps:
[( 321 - 323 ) ÷ 323] x 100 = -0.62%
Formula
Percentage change = [(321 - 323) / 323] x 100
Subtract the new number by the original number
321 - 323 = -2
-2 ÷ 323 = -0.006191950464396285
-0.006191950464396285 x 100 = -0.62%