-67.68% is the change from 823 to 266
Calculation steps:
[( 266 - 823 ) ÷ 823] x 100 = -67.68%
Formula
Percentage change = [(266 - 823) / 823] x 100
Subtract the new number by the original number
266 - 823 = -557
-557 ÷ 823 = -0.6767922235722965
-0.6767922235722965 x 100 = -67.68%