-67.67% is the change from 866 to 280
Calculation steps:
[( 280 - 866 ) ÷ 866] x 100 = -67.67%
Formula
Percentage change = [(280 - 866) / 866] x 100
Subtract the new number by the original number
280 - 866 = -586
-586 ÷ 866 = -0.6766743648960739
-0.6766743648960739 x 100 = -67.67%