-64.69% is the change from 909 to 321
Calculation steps:
[( 321 - 909 ) ÷ 909] x 100 = -64.69%
Formula
Percentage change = [(321 - 909) / 909] x 100
Subtract the new number by the original number
321 - 909 = -588
-588 ÷ 909 = -0.6468646864686468
-0.6468646864686468 x 100 = -64.69%