-51.51% is the change from 662 to 321
Calculation steps:
[( 321 - 662 ) ÷ 662] x 100 = -51.51%
Formula
Percentage change = [(321 - 662) / 662] x 100
Subtract the new number by the original number
321 - 662 = -341
-341 ÷ 662 = -0.5151057401812689
-0.5151057401812689 x 100 = -51.51%