-99.65% is the change from 866 to 3
Calculation steps:
[( 3 - 866 ) ÷ 866] x 100 = -99.65%
Formula
Percentage change = [(3 - 866) / 866] x 100
Subtract the new number by the original number
3 - 866 = -863
-863 ÷ 866 = -0.9965357967667436
-0.9965357967667436 x 100 = -99.65%