-5.77% is the change from 866 to 816
Calculation steps:
[( 816 - 866 ) ÷ 866] x 100 = -5.77%
Formula
Percentage change = [(816 - 866) / 866] x 100
Subtract the new number by the original number
816 - 866 = -50
-50 ÷ 866 = -0.057736720554272515
-0.057736720554272515 x 100 = -5.77%