-19.37% is the change from 826 to 666
Calculation steps:
[( 666 - 826 ) ÷ 826] x 100 = -19.37%
Formula
Percentage change = [(666 - 826) / 826] x 100
Subtract the new number by the original number
666 - 826 = -160
-160 ÷ 826 = -0.1937046004842615
-0.1937046004842615 x 100 = -19.37%