-51.29% is the change from 659 to 321
Calculation steps:
[( 321 - 659 ) ÷ 659] x 100 = -51.29%
Formula
Percentage change = [(321 - 659) / 659] x 100
Subtract the new number by the original number
321 - 659 = -338
-338 ÷ 659 = -0.5128983308042488
-0.5128983308042488 x 100 = -51.29%