-2.39% is the change from 877 to 856
Calculation steps:
[( 856 - 877 ) ÷ 877] x 100 = -2.39%
Formula
Percentage change = [(856 - 877) / 877] x 100
Subtract the new number by the original number
856 - 877 = -21
-21 ÷ 877 = -0.02394526795895097
-0.02394526795895097 x 100 = -2.39%