-52.79% is the change from 680 to 321
Calculation steps:
[( 321 - 680 ) ÷ 680] x 100 = -52.79%
Formula
Percentage change = [(321 - 680) / 680] x 100
Subtract the new number by the original number
321 - 680 = -359
-359 ÷ 680 = -0.5279411764705882
-0.5279411764705882 x 100 = -52.79%