-20.67% is the change from 866 to 687
Calculation steps:
[( 687 - 866 ) ÷ 866] x 100 = -20.67%
Formula
Percentage change = [(687 - 866) / 866] x 100
Subtract the new number by the original number
687 - 866 = -179
-179 ÷ 866 = -0.2066974595842956
-0.2066974595842956 x 100 = -20.67%