-52.65% is the change from 678 to 321
Calculation steps:
[( 321 - 678 ) ÷ 678] x 100 = -52.65%
Formula
Percentage change = [(321 - 678) / 678] x 100
Subtract the new number by the original number
321 - 678 = -357
-357 ÷ 678 = -0.5265486725663717
-0.5265486725663717 x 100 = -52.65%