-3.86% is the change from 856 to 823
Calculation steps:
[( 823 - 856 ) ÷ 856] x 100 = -3.86%
Formula
Percentage change = [(823 - 856) / 856] x 100
Subtract the new number by the original number
823 - 856 = -33
-33 ÷ 856 = -0.038551401869158876
-0.038551401869158876 x 100 = -3.86%