-60.62% is the change from 810 to 319
Calculation steps:
[( 319 - 810 ) ÷ 810] x 100 = -60.62%
Formula
Percentage change = [(319 - 810) / 810] x 100
Subtract the new number by the original number
319 - 810 = -491
-491 ÷ 810 = -0.6061728395061728
-0.6061728395061728 x 100 = -60.62%