-62.93% is the change from 866 to 321
Calculation steps:
[( 321 - 866 ) ÷ 866] x 100 = -62.93%
Formula
Percentage change = [(321 - 866) / 866] x 100
Subtract the new number by the original number
321 - 866 = -545
-545 ÷ 866 = -0.6293302540415704
-0.6293302540415704 x 100 = -62.93%