-18.98% is the change from 822 to 666
Calculation steps:
[( 666 - 822 ) ÷ 822] x 100 = -18.98%
Formula
Percentage change = [(666 - 822) / 822] x 100
Subtract the new number by the original number
666 - 822 = -156
-156 ÷ 822 = -0.1897810218978102
-0.1897810218978102 x 100 = -18.98%