-68.23% is the change from 809 to 257
Calculation steps:
[( 257 - 809 ) ÷ 809] x 100 = -68.23%
Formula
Percentage change = [(257 - 809) / 809] x 100
Subtract the new number by the original number
257 - 809 = -552
-552 ÷ 809 = -0.6823238566131026
-0.6823238566131026 x 100 = -68.23%