-66.58% is the change from 811 to 271
Calculation steps:
[( 271 - 811 ) ÷ 811] x 100 = -66.58%
Formula
Percentage change = [(271 - 811) / 811] x 100
Subtract the new number by the original number
271 - 811 = -540
-540 ÷ 811 = -0.6658446362515413
-0.6658446362515413 x 100 = -66.58%