-71.25% is the change from 866 to 249
Calculation steps:
[( 249 - 866 ) ÷ 866] x 100 = -71.25%
Formula
Percentage change = [(249 - 866) / 866] x 100
Subtract the new number by the original number
249 - 866 = -617
-617 ÷ 866 = -0.7124711316397229
-0.7124711316397229 x 100 = -71.25%