-13.19% is the change from 91 to 79
Calculation steps:
[( 79 - 91 ) ÷ 91] x 100 = -13.19%
Formula
Percentage change = [(79 - 91) / 91] x 100
Subtract the new number by the original number
79 - 91 = -12
-12 ÷ 91 = -0.13186813186813187
-0.13186813186813187 x 100 = -13.19%