-22.9% is the change from 856 to 660
Calculation steps:
[( 660 - 856 ) ÷ 856] x 100 = -22.9%
Formula
Percentage change = [(660 - 856) / 856] x 100
Subtract the new number by the original number
660 - 856 = -196
-196 ÷ 856 = -0.22897196261682243
-0.22897196261682243 x 100 = -22.9%