-62.72% is the change from 861 to 321
Calculation steps:
[( 321 - 861 ) ÷ 861] x 100 = -62.72%
Formula
Percentage change = [(321 - 861) / 861] x 100
Subtract the new number by the original number
321 - 861 = -540
-540 ÷ 861 = -0.627177700348432
-0.627177700348432 x 100 = -62.72%