-38.4% is the change from 810 to 499
Calculation steps:
[( 499 - 810 ) ÷ 810] x 100 = -38.4%
Formula
Percentage change = [(499 - 810) / 810] x 100
Subtract the new number by the original number
499 - 810 = -311
-311 ÷ 810 = -0.38395061728395063
-0.38395061728395063 x 100 = -38.4%