-90.99% is the change from 866 to 78
Calculation steps:
[( 78 - 866 ) ÷ 866] x 100 = -90.99%
Formula
Percentage change = [(78 - 866) / 866] x 100
Subtract the new number by the original number
78 - 866 = -788
-788 ÷ 866 = -0.9099307159353349
-0.9099307159353349 x 100 = -90.99%