-61.06% is the change from 809 to 315
Calculation steps:
[( 315 - 809 ) ÷ 809] x 100 = -61.06%
Formula
Percentage change = [(315 - 809) / 809] x 100
Subtract the new number by the original number
315 - 809 = -494
-494 ÷ 809 = -0.6106304079110012
-0.6106304079110012 x 100 = -61.06%