-97.78% is the change from 856 to 19
Calculation steps:
[( 19 - 856 ) ÷ 856] x 100 = -97.78%
Formula
Percentage change = [(19 - 856) / 856] x 100
Subtract the new number by the original number
19 - 856 = -837
-837 ÷ 856 = -0.977803738317757
-0.977803738317757 x 100 = -97.78%