-65.47% is the change from 811 to 280
Calculation steps:
[( 280 - 811 ) ÷ 811] x 100 = -65.47%
Formula
Percentage change = [(280 - 811) / 811] x 100
Subtract the new number by the original number
280 - 811 = -531
-531 ÷ 811 = -0.654747225647349
-0.654747225647349 x 100 = -65.47%