-61.56% is the change from 809 to 311
Calculation steps:
[( 311 - 809 ) ÷ 809] x 100 = -61.56%
Formula
Percentage change = [(311 - 809) / 809] x 100
Subtract the new number by the original number
311 - 809 = -498
-498 ÷ 809 = -0.61557478368356
-0.61557478368356 x 100 = -61.56%