-70.76% is the change from 277 to 81
Calculation steps:
[( 81 - 277 ) ÷ 277] x 100 = -70.76%
Formula
Percentage change = [(81 - 277) / 277] x 100
Subtract the new number by the original number
81 - 277 = -196
-196 ÷ 277 = -0.7075812274368231
-0.7075812274368231 x 100 = -70.76%