-62.8% is the change from 863 to 321
Calculation steps:
[( 321 - 863 ) ÷ 863] x 100 = -62.8%
Formula
Percentage change = [(321 - 863) / 863] x 100
Subtract the new number by the original number
321 - 863 = -542
-542 ÷ 863 = -0.6280417149478563
-0.6280417149478563 x 100 = -62.8%