-21.59% is the change from 866 to 679
Calculation steps:
[( 679 - 866 ) ÷ 866] x 100 = -21.59%
Formula
Percentage change = [(679 - 866) / 866] x 100
Subtract the new number by the original number
679 - 866 = -187
-187 ÷ 866 = -0.21593533487297922
-0.21593533487297922 x 100 = -21.59%