-21.48% is the change from 866 to 680
Calculation steps:
[( 680 - 866 ) ÷ 866] x 100 = -21.48%
Formula
Percentage change = [(680 - 866) / 866] x 100
Subtract the new number by the original number
680 - 866 = -186
-186 ÷ 866 = -0.21478060046189376
-0.21478060046189376 x 100 = -21.48%