-13.13% is the change from 99 to 86
Calculation steps:
[( 86 - 99 ) ÷ 99] x 100 = -13.13%
Formula
Percentage change = [(86 - 99) / 99] x 100
Subtract the new number by the original number
86 - 99 = -13
-13 ÷ 99 = -0.13131313131313133
-0.13131313131313133 x 100 = -13.13%