-23.79% is the change from 866 to 660
Calculation steps:
[( 660 - 866 ) ÷ 866] x 100 = -23.79%
Formula
Percentage change = [(660 - 866) / 866] x 100
Subtract the new number by the original number
660 - 866 = -206
-206 ÷ 866 = -0.23787528868360278
-0.23787528868360278 x 100 = -23.79%