-9.11% is the change from 856 to 778
Calculation steps:
[( 778 - 856 ) ÷ 856] x 100 = -9.11%
Formula
Percentage change = [(778 - 856) / 856] x 100
Subtract the new number by the original number
778 - 856 = -78
-78 ÷ 856 = -0.0911214953271028
-0.0911214953271028 x 100 = -9.11%