-68.3% is the change from 839 to 266
Calculation steps:
[( 266 - 839 ) ÷ 839] x 100 = -68.3%
Formula
Percentage change = [(266 - 839) / 839] x 100
Subtract the new number by the original number
266 - 839 = -573
-573 ÷ 839 = -0.6829558998808105
-0.6829558998808105 x 100 = -68.3%