-4.36% is the change from 321 to 307
Calculation steps:
[( 307 - 321 ) ÷ 321] x 100 = -4.36%
Formula
Percentage change = [(307 - 321) / 321] x 100
Subtract the new number by the original number
307 - 321 = -14
-14 ÷ 321 = -0.04361370716510903
-0.04361370716510903 x 100 = -4.36%