-63.05% is the change from 866 to 320
Calculation steps:
[( 320 - 866 ) ÷ 866] x 100 = -63.05%
Formula
Percentage change = [(320 - 866) / 866] x 100
Subtract the new number by the original number
320 - 866 = -546
-546 ÷ 866 = -0.6304849884526559
-0.6304849884526559 x 100 = -63.05%