-19.2% is the change from 823 to 665
Calculation steps:
[( 665 - 823 ) ÷ 823] x 100 = -19.2%
Formula
Percentage change = [(665 - 823) / 823] x 100
Subtract the new number by the original number
665 - 823 = -158
-158 ÷ 823 = -0.1919805589307412
-0.1919805589307412 x 100 = -19.2%