-9.86% is the change from 913 to 823
Calculation steps:
[( 823 - 913 ) ÷ 913] x 100 = -9.86%
Formula
Percentage change = [(823 - 913) / 913] x 100
Subtract the new number by the original number
823 - 913 = -90
-90 ÷ 913 = -0.09857612267250822
-0.09857612267250822 x 100 = -9.86%