-49.51% is the change from 810 to 409
Calculation steps:
[( 409 - 810 ) ÷ 810] x 100 = -49.51%
Formula
Percentage change = [(409 - 810) / 810] x 100
Subtract the new number by the original number
409 - 810 = -401
-401 ÷ 810 = -0.49506172839506174
-0.49506172839506174 x 100 = -49.51%