-69.55% is the change from 266 to 81
Calculation steps:
[( 81 - 266 ) ÷ 266] x 100 = -69.55%
Formula
Percentage change = [(81 - 266) / 266] x 100
Subtract the new number by the original number
81 - 266 = -185
-185 ÷ 266 = -0.6954887218045113
-0.6954887218045113 x 100 = -69.55%