-84.94% is the change from 817 to 123
Calculation steps:
[( 123 - 817 ) ÷ 817] x 100 = -84.94%
Formula
Percentage change = [(123 - 817) / 817] x 100
Subtract the new number by the original number
123 - 817 = -694
-694 ÷ 817 = -0.8494492044063647
-0.8494492044063647 x 100 = -84.94%