-10.47% is the change from 86 to 77
Calculation steps:
[( 77 - 86 ) ÷ 86] x 100 = -10.47%
Formula
Percentage change = [(77 - 86) / 86] x 100
Subtract the new number by the original number
77 - 86 = -9
-9 ÷ 86 = -0.10465116279069768
-0.10465116279069768 x 100 = -10.47%