-56.45% is the change from 186 to 81
Calculation steps:
[( 81 - 186 ) ÷ 186] x 100 = -56.45%
Formula
Percentage change = [(81 - 186) / 186] x 100
Subtract the new number by the original number
81 - 186 = -105
-105 ÷ 186 = -0.5645161290322581
-0.5645161290322581 x 100 = -56.45%