-61.78% is the change from 811 to 310
Calculation steps:
[( 310 - 811 ) ÷ 811] x 100 = -61.78%
Formula
Percentage change = [(310 - 811) / 811] x 100
Subtract the new number by the original number
310 - 811 = -501
-501 ÷ 811 = -0.6177558569667078
-0.6177558569667078 x 100 = -61.78%