-11.96% is the change from 92 to 81
Calculation steps:
[( 81 - 92 ) ÷ 92] x 100 = -11.96%
Formula
Percentage change = [(81 - 92) / 92] x 100
Subtract the new number by the original number
81 - 92 = -11
-11 ÷ 92 = -0.11956521739130435
-0.11956521739130435 x 100 = -11.96%