-66.71% is the change from 811 to 270
Calculation steps:
[( 270 - 811 ) ÷ 811] x 100 = -66.71%
Formula
Percentage change = [(270 - 811) / 811] x 100
Subtract the new number by the original number
270 - 811 = -541
-541 ÷ 811 = -0.6670776818742293
-0.6670776818742293 x 100 = -66.71%