-9.09% is the change from 913 to 830
Calculation steps:
[( 830 - 913 ) ÷ 913] x 100 = -9.09%
Formula
Percentage change = [(830 - 913) / 913] x 100
Subtract the new number by the original number
830 - 913 = -83
-83 ÷ 913 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%