-6.12% is the change from 866 to 813
Calculation steps:
[( 813 - 866 ) ÷ 866] x 100 = -6.12%
Formula
Percentage change = [(813 - 866) / 866] x 100
Subtract the new number by the original number
813 - 866 = -53
-53 ÷ 866 = -0.061200923787528866
-0.061200923787528866 x 100 = -6.12%