-9.66% is the change from 911 to 823
Calculation steps:
[( 823 - 911 ) ÷ 911] x 100 = -9.66%
Formula
Percentage change = [(823 - 911) / 911] x 100
Subtract the new number by the original number
823 - 911 = -88
-88 ÷ 911 = -0.09659714599341383
-0.09659714599341383 x 100 = -9.66%