-16.16% is the change from 99 to 83
Calculation steps:
[( 83 - 99 ) ÷ 99] x 100 = -16.16%
Formula
Percentage change = [(83 - 99) / 99] x 100
Subtract the new number by the original number
83 - 99 = -16
-16 ÷ 99 = -0.16161616161616163
-0.16161616161616163 x 100 = -16.16%