-76.21% is the change from 866 to 206
Calculation steps:
[( 206 - 866 ) ÷ 866] x 100 = -76.21%
Formula
Percentage change = [(206 - 866) / 866] x 100
Subtract the new number by the original number
206 - 866 = -660
-660 ÷ 866 = -0.7621247113163973
-0.7621247113163973 x 100 = -76.21%