-90.91% is the change from 913 to 83
Calculation steps:
[( 83 - 913 ) ÷ 913] x 100 = -90.91%
Formula
Percentage change = [(83 - 913) / 913] x 100
Subtract the new number by the original number
83 - 913 = -830
-830 ÷ 913 = -0.9090909090909091
-0.9090909090909091 x 100 = -90.91%