-66.97% is the change from 866 to 286
Calculation steps:
[( 286 - 866 ) ÷ 866] x 100 = -66.97%
Formula
Percentage change = [(286 - 866) / 866] x 100
Subtract the new number by the original number
286 - 866 = -580
-580 ÷ 866 = -0.6697459584295612
-0.6697459584295612 x 100 = -66.97%