-9.31% is the change from 913 to 828
Calculation steps:
[( 828 - 913 ) ÷ 913] x 100 = -9.31%
Formula
Percentage change = [(828 - 913) / 913] x 100
Subtract the new number by the original number
828 - 913 = -85
-85 ÷ 913 = -0.09309967141292443
-0.09309967141292443 x 100 = -9.31%