-98.6% is the change from 860 to 12
Calculation steps:
[( 12 - 860 ) ÷ 860] x 100 = -98.6%
Formula
Percentage change = [(12 - 860) / 860] x 100
Subtract the new number by the original number
12 - 860 = -848
-848 ÷ 860 = -0.986046511627907
-0.986046511627907 x 100 = -98.6%