-24.44% is the change from 855 to 646
Calculation steps:
[( 646 - 855 ) ÷ 855] x 100 = -24.44%
Formula
Percentage change = [(646 - 855) / 855] x 100
Subtract the new number by the original number
646 - 855 = -209
-209 ÷ 855 = -0.24444444444444444
-0.24444444444444444 x 100 = -24.44%