-58.08% is the change from 811 to 340
Calculation steps:
[( 340 - 811 ) ÷ 811] x 100 = -58.08%
Formula
Percentage change = [(340 - 811) / 811] x 100
Subtract the new number by the original number
340 - 811 = -471
-471 ÷ 811 = -0.5807644882860666
-0.5807644882860666 x 100 = -58.08%