-22.2% is the change from 856 to 666
Calculation steps:
[( 666 - 856 ) ÷ 856] x 100 = -22.2%
Formula
Percentage change = [(666 - 856) / 856] x 100
Subtract the new number by the original number
666 - 856 = -190
-190 ÷ 856 = -0.2219626168224299
-0.2219626168224299 x 100 = -22.2%