-98.6% is the change from 856 to 12
Calculation steps:
[( 12 - 856 ) ÷ 856] x 100 = -98.6%
Formula
Percentage change = [(12 - 856) / 856] x 100
Subtract the new number by the original number
12 - 856 = -844
-844 ÷ 856 = -0.985981308411215
-0.985981308411215 x 100 = -98.6%