-73.9% is the change from 866 to 226
Calculation steps:
[( 226 - 866 ) ÷ 866] x 100 = -73.9%
Formula
Percentage change = [(226 - 866) / 866] x 100
Subtract the new number by the original number
226 - 866 = -640
-640 ÷ 866 = -0.7390300230946882
-0.7390300230946882 x 100 = -73.9%